diff --git a/accessible/atk/AccessibleWrap.cpp b/accessible/atk/AccessibleWrap.cpp
index cca059e9b34c..5f98faac2cc5 100644
--- a/accessible/atk/AccessibleWrap.cpp
+++ b/accessible/atk/AccessibleWrap.cpp
@@ -12,7 +12,6 @@
 #include "nsAccUtils.h"
 #include "nsIAccessibleRelation.h"
 #include "nsIAccessibleTable.h"
-#include "ProxyAccessible.h"
 #include "RootAccessible.h"
 #include "nsIAccessibleValue.h"
 #include "nsMai.h"
@@ -21,7 +20,6 @@
 #include "nsAutoPtr.h"
 #include "prprf.h"
 #include "nsStateMap.h"
-#include "mozilla/a11y/Platform.h"
 #include "Relation.h"
 #include "RootAccessible.h"
 #include "States.h"
@@ -135,13 +133,9 @@ struct MaiAtkObject
    * The AccessibleWrap whose properties and features are exported
    * via this object instance.
    */
-  uintptr_t accWrap;
+  AccessibleWrap* accWrap;
 };
 
-// This is or'd with the pointer in MaiAtkObject::accWrap if the wrap-ee is a
-// proxy.
-static const uintptr_t IS_PROXY = 1;
-
 struct MaiAtkObjectClass
 {
     AtkObjectClass parent_class;
@@ -254,7 +248,7 @@ AccessibleWrap::ShutdownAtkObject()
 {
     if (mAtkObject) {
         if (IS_MAI_OBJECT(mAtkObject)) {
-            MAI_ATK_OBJECT(mAtkObject)->accWrap = 0;
+            MAI_ATK_OBJECT(mAtkObject)->accWrap = nullptr;
         }
         SetMaiHyperlink(nullptr);
         g_object_unref(mAtkObject);
@@ -588,7 +582,8 @@ initializeCB(AtkObject *aAtkObj, gpointer aData)
         ATK_OBJECT_CLASS(parent_class)->initialize(aAtkObj, aData);
 
   /* initialize object */
-  MAI_ATK_OBJECT(aAtkObj)->accWrap = reinterpret_cast<uintptr_t>(aData);
+  MAI_ATK_OBJECT(aAtkObj)->accWrap =
+    static_cast<AccessibleWrap*>(aData);
 }
 
 void
@@ -596,7 +591,7 @@ finalizeCB(GObject *aObj)
 {
     if (!IS_MAI_OBJECT(aObj))
         return;
-    NS_ASSERTION(MAI_ATK_OBJECT(aObj)->accWrap == 0, "AccWrap NOT null");
+    NS_ASSERTION(MAI_ATK_OBJECT(aObj)->accWrap == nullptr, "AccWrap NOT null");
 
     // call parent finalize function
     // finalize of GObjectClass will unref the accessible parent if has
@@ -668,25 +663,17 @@ getDescriptionCB(AtkObject *aAtkObj)
 AtkRole
 getRoleCB(AtkObject *aAtkObj)
 {
-  if (aAtkObj->role != ATK_ROLE_INVALID)
-    return aAtkObj->role;
-
   AccessibleWrap* accWrap = GetAccessibleWrap(aAtkObj);
-  a11y::role role;
-  if (!accWrap) {
-    ProxyAccessible* proxy = GetProxy(aAtkObj);
-    if (!proxy)
-      return ATK_ROLE_INVALID;
+  if (!accWrap)
+    return ATK_ROLE_INVALID;
 
-    role = proxy->Role();
-  } else {
 #ifdef DEBUG
-    NS_ASSERTION(nsAccUtils::IsTextInterfaceSupportCorrect(accWrap),
-                 "Does not support nsIAccessibleText when it should");
+  NS_ASSERTION(nsAccUtils::IsTextInterfaceSupportCorrect(accWrap),
+      "Does not support nsIAccessibleText when it should");
 #endif
 
-    role = accWrap->Role();
-  }
+  if (aAtkObj->role != ATK_ROLE_INVALID)
+    return aAtkObj->role;
 
 #define ROLE(geckoRole, stringRole, atkRole, macRole, \
              msaaRole, ia2Role, nameRule) \
@@ -694,7 +681,7 @@ getRoleCB(AtkObject *aAtkObj)
     aAtkObj->role = atkRole; \
     break;
 
-  switch (role) {
+  switch (accWrap->Role()) {
 #include "RoleMap.h"
     default:
       MOZ_CRASH("Unknown role.");
@@ -959,13 +946,7 @@ AccessibleWrap*
 GetAccessibleWrap(AtkObject* aAtkObj)
 {
   NS_ENSURE_TRUE(IS_MAI_OBJECT(aAtkObj), nullptr);
-
-  // Make sure its native is an AccessibleWrap not a proxy.
-  if (MAI_ATK_OBJECT(aAtkObj)->accWrap & IS_PROXY)
-    return nullptr;
-
-    AccessibleWrap* accWrap =
-      reinterpret_cast<AccessibleWrap*>(MAI_ATK_OBJECT(aAtkObj)->accWrap);
+  AccessibleWrap* accWrap = MAI_ATK_OBJECT(aAtkObj)->accWrap;
 
   // Check if the accessible was deconstructed.
   if (!accWrap)
@@ -980,49 +961,6 @@ GetAccessibleWrap(AtkObject* aAtkObj)
   return accWrap;
 }
 
-ProxyAccessible*
-GetProxy(AtkObject* aObj)
-{
-  if (!aObj || !(MAI_ATK_OBJECT(aObj)->accWrap & IS_PROXY))
-    return nullptr;
-
-  return reinterpret_cast<ProxyAccessible*>(MAI_ATK_OBJECT(aObj)->accWrap
-      & ~IS_PROXY);
-}
-
-static uint16_t
-GetInterfacesForProxy(ProxyAccessible* aProxy)
-{
-  return MAI_INTERFACE_COMPONENT;
-}
-
-void
-a11y::ProxyCreated(ProxyAccessible* aProxy)
-{
-  GType type = GetMaiAtkType(GetInterfacesForProxy(aProxy));
-  NS_ASSERTION(type, "why don't we have a type!");
-
-  AtkObject* obj =
-    reinterpret_cast<AtkObject *>
-    (g_object_new(type, nullptr));
-  if (!obj)
-    return;
-
-  atk_object_initialize(obj, aProxy);
-  obj->role = ATK_ROLE_INVALID;
-  obj->layer = ATK_LAYER_INVALID;
-  aProxy->SetWrapper(reinterpret_cast<uintptr_t>(obj) | IS_PROXY);
-}
-
-void
-a11y::ProxyDestroyed(ProxyAccessible* aProxy)
-{
-  auto obj = reinterpret_cast<MaiAtkObject*>(aProxy->GetWrapper() & ~IS_PROXY);
-  obj->accWrap = 0;
-  g_object_unref(obj);
-  aProxy->SetWrapper(0);
-}
-
 nsresult
 AccessibleWrap::HandleAccEvent(AccEvent* aEvent)
 {
diff --git a/accessible/atk/AccessibleWrap.h b/accessible/atk/AccessibleWrap.h
index 95d03c5fc16c..5518a80bd5d8 100644
--- a/accessible/atk/AccessibleWrap.h
+++ b/accessible/atk/AccessibleWrap.h
@@ -97,7 +97,7 @@ private:
 
   static EAvailableAtkSignals gAvailableAtkSignals;
 
-  uint16_t CreateMaiInterfaces();
+  uint16_t CreateMaiInterfaces(void);
 };
 
 } // namespace a11y
diff --git a/accessible/atk/moz.build b/accessible/atk/moz.build
index 96fc8cee15d7..37ec9e8fded5 100644
--- a/accessible/atk/moz.build
+++ b/accessible/atk/moz.build
@@ -35,7 +35,6 @@ LOCAL_INCLUDES += [
     '/accessible/base',
     '/accessible/generic',
     '/accessible/html',
-    '/accessible/ipc',
     '/accessible/xpcom',
     '/accessible/xul',
     '/other-licenses/atk-1.0',
diff --git a/accessible/atk/nsMai.h b/accessible/atk/nsMai.h
index 6338a3492bae..5de552ac67a5 100644
--- a/accessible/atk/nsMai.h
+++ b/accessible/atk/nsMai.h
@@ -13,12 +13,6 @@
 
 #include "AccessibleWrap.h"
 
-namespace mozilla {
-namespace a11y {
-class ProxyAccessible;
-}
-}
-
 #define MAI_TYPE_ATK_OBJECT             (mai_atk_object_get_type ())
 #define MAI_ATK_OBJECT(obj)             (G_TYPE_CHECK_INSTANCE_CAST ((obj), \
                                          MAI_TYPE_ATK_OBJECT, MaiAtkObject))
@@ -35,7 +29,6 @@ class ProxyAccessible;
 GType mai_atk_object_get_type(void);
 GType mai_util_get_type();
 mozilla::a11y::AccessibleWrap* GetAccessibleWrap(AtkObject* aAtkObj);
-mozilla::a11y::ProxyAccessible* GetProxy(AtkObject* aAtkObj);
 
 extern int atkMajorVersion, atkMinorVersion;
 
diff --git a/accessible/base/AccEvent.h b/accessible/base/AccEvent.h
index ee28efa511b6..f97b1fc4e01b 100644
--- a/accessible/base/AccEvent.h
+++ b/accessible/base/AccEvent.h
@@ -232,8 +232,6 @@ public:
   bool IsShow() const { return mEventType == nsIAccessibleEvent::EVENT_SHOW; }
   bool IsHide() const { return mEventType == nsIAccessibleEvent::EVENT_HIDE; }
 
-  Accessible* Parent() const { return mParent; }
-
 protected:
   nsCOMPtr<nsINode> mNode;
   nsRefPtr<Accessible> mParent;
diff --git a/accessible/base/DocManager.cpp b/accessible/base/DocManager.cpp
index 985ba64f5853..eed51d5ca01a 100644
--- a/accessible/base/DocManager.cpp
+++ b/accessible/base/DocManager.cpp
@@ -8,7 +8,6 @@
 #include "ApplicationAccessible.h"
 #include "ARIAMap.h"
 #include "DocAccessible-inl.h"
-#include "DocAccessibleChild.h"
 #include "nsAccessibilityService.h"
 #include "RootAccessibleWrap.h"
 
@@ -28,8 +27,6 @@
 #include "nsServiceManagerUtils.h"
 #include "nsIWebProgress.h"
 #include "nsCoreUtils.h"
-#include "nsXULAppAPI.h"
-#include "mozilla/dom/ContentChild.h"
 
 using namespace mozilla;
 using namespace mozilla::a11y;
@@ -421,12 +418,6 @@ DocManager::CreateDocOrRootAccessible(nsIDocument* aDocument)
     docAcc->FireDelayedEvent(nsIAccessibleEvent::EVENT_REORDER,
                              ApplicationAcc());
 
-    if (XRE_GetProcessType() != GeckoProcessType_Default) {
-      DocAccessibleChild* ipcDoc = new DocAccessibleChild(docAcc);
-      docAcc->SetIPCDoc(ipcDoc);
-    auto contentChild = dom::ContentChild::GetSingleton();
-    contentChild->SendPDocAccessibleConstructor(ipcDoc, nullptr, 0);
-    }
   } else {
     parentDocAcc->BindChildDocument(docAcc);
   }
diff --git a/accessible/base/DocManager.h b/accessible/base/DocManager.h
index 69193820eb67..13e80a602372 100644
--- a/accessible/base/DocManager.h
+++ b/accessible/base/DocManager.h
@@ -17,7 +17,6 @@ namespace a11y {
 
 class Accessible;
 class DocAccessible;
-class DocAccessibleParent;
 
 /**
  * Manage the document accessible life cycle.
@@ -66,25 +65,6 @@ public:
     RemoveListeners(aDocument);
   }
 
-  /*
-   * Notification that a top level document in a content process has gone away.
-   */
-  void RemoteDocShutdown(DocAccessibleParent* aDoc)
-  {
-    DebugOnly<bool> result = mRemoteDocuments.RemoveElement(aDoc);
-    MOZ_ASSERT(result, "Why didn't we find the document!");
-  }
-
-  /*
-   * Notify of a new top level document in a content process.
-   */
-  void RemoteDocAdded(DocAccessibleParent* aDoc)
-  {
-    MOZ_ASSERT(!mRemoteDocuments.Contains(aDoc),
-               "How did we already have the doc!");
-    mRemoteDocuments.AppendElement(aDoc);
-  }
-
 #ifdef DEBUG
   bool IsProcessingRefreshDriverNotification() const;
 #endif
@@ -164,11 +144,6 @@ private:
 #endif
 
   DocAccessibleHashtable mDocAccessibleCache;
-
-  /*
-   * The list of remote top level documents.
-   */
-  nsTArray<DocAccessibleParent*> mRemoteDocuments;
 };
 
 /**
diff --git a/accessible/base/EventQueue.cpp b/accessible/base/EventQueue.cpp
index 65102917efef..6338785e49c9 100644
--- a/accessible/base/EventQueue.cpp
+++ b/accessible/base/EventQueue.cpp
@@ -8,7 +8,6 @@
 #include "Accessible-inl.h"
 #include "nsEventShell.h"
 #include "DocAccessible.h"
-#include "DocAccessibleChild.h"
 #include "nsAccessibilityService.h"
 #include "nsTextEquivUtils.h"
 #ifdef A11Y_LOG
@@ -556,15 +555,5 @@ EventQueue::ProcessEventQueue()
 
     if (!mDocument)
       return;
-
-    if (XRE_GetProcessType() != GeckoProcessType_Default) {
-    DocAccessibleChild* ipcDoc = mDocument->IPCDoc();
-      if (event->mEventType == nsIAccessibleEvent::EVENT_SHOW)
-        ipcDoc->ShowEvent(downcast_accEvent(event));
-      else if (event->mEventType == nsIAccessibleEvent::EVENT_HIDE)
-        ipcDoc->SendHideEvent(reinterpret_cast<uintptr_t>(event->GetAccessible()));
-      else
-        ipcDoc->SendEvent(event->GetEventType());
-    }
   }
 }
diff --git a/accessible/base/NotificationController.cpp b/accessible/base/NotificationController.cpp
index b45e23a2ab69..82a591ab72c1 100644
--- a/accessible/base/NotificationController.cpp
+++ b/accessible/base/NotificationController.cpp
@@ -6,11 +6,9 @@
 #include "NotificationController.h"
 
 #include "DocAccessible-inl.h"
-#include "DocAccessibleChild.h"
 #include "TextLeafAccessible.h"
 #include "TextUpdater.h"
 
-#include "mozilla/dom/ContentChild.h"
 #include "mozilla/dom/Element.h"
 #include "mozilla/Telemetry.h"
 
@@ -219,19 +217,8 @@ NotificationController::WillRefresh(mozilla::TimeStamp aTime)
     if (ownerContent) {
       Accessible* outerDocAcc = mDocument->GetAccessible(ownerContent);
       if (outerDocAcc && outerDocAcc->AppendChild(childDoc)) {
-        if (mDocument->AppendChildDocument(childDoc)) {
-          if (XRE_GetProcessType() != GeckoProcessType_Default) {
-            DocAccessibleChild* ipcDoc = new DocAccessibleChild(childDoc);
-            childDoc->SetIPCDoc(ipcDoc);
-            auto contentChild = dom::ContentChild::GetSingleton();
-            DocAccessibleChild* parentIPCDoc = mDocument->IPCDoc();
-            uint64_t id = reinterpret_cast<uintptr_t>(outerDocAcc->UniqueID());
-            contentChild->SendPDocAccessibleConstructor(ipcDoc, parentIPCDoc,
-                                                        id);
-          }
-
+        if (mDocument->AppendChildDocument(childDoc))
           continue;
-        }
 
         outerDocAcc->RemoveChild(childDoc);
       }
diff --git a/accessible/base/Platform.h b/accessible/base/Platform.h
index 41954be440d8..fa56963fdbed 100644
--- a/accessible/base/Platform.h
+++ b/accessible/base/Platform.h
@@ -7,8 +7,6 @@
 namespace mozilla {
 namespace a11y {
 
-class ProxyAccessible;
-
 enum EPlatformDisabledState {
   ePlatformIsForceEnabled = -1,
   ePlatformIsEnabled = 0,
@@ -49,17 +47,6 @@ void PlatformInit();
  */
 void PlatformShutdown();
 
-/**
- * called when a new ProxyAccessible is created, so the platform may setup a
- * wrapper for it, or take other action.
- */
-void ProxyCreated(ProxyAccessible*);
-
-/**
- * Called just before a ProxyAccessible is destroyed so its wrapper can be
- * disposed of and other action taken.
- */
-void ProxyDestroyed(ProxyAccessible*);
 } // namespace a11y
 } // namespace mozilla
 
diff --git a/accessible/base/Role.h b/accessible/base/Role.h
index 0d5746f3dc13..2cd378d64482 100644
--- a/accessible/base/Role.h
+++ b/accessible/base/Role.h
@@ -783,9 +783,7 @@ enum Role {
   /**
    * Represent a keyboard or keypad key (ARIA role "key").
    */
-  KEY = 129,
-
-  LAST_ROLE = KEY
+  KEY = 129
 };
 
 } // namespace role
diff --git a/accessible/base/moz.build b/accessible/base/moz.build
index 0dad363cc445..e31cf3e5c4c3 100644
--- a/accessible/base/moz.build
+++ b/accessible/base/moz.build
@@ -60,7 +60,6 @@ if CONFIG['A11Y_LOG']:
 LOCAL_INCLUDES += [
     '/accessible/generic',
     '/accessible/html',
-    '/accessible/ipc',
     '/accessible/xpcom',
     '/accessible/xul',
     '/dom/xbl',
@@ -94,5 +93,3 @@ FINAL_LIBRARY = 'xul'
 
 if CONFIG['MOZ_ENABLE_GTK']:
     CXXFLAGS += CONFIG['MOZ_CAIRO_CFLAGS']
-
-include('/ipc/chromium/chromium-config.mozbuild')
diff --git a/accessible/generic/DocAccessible.cpp b/accessible/generic/DocAccessible.cpp
index 369700260b2a..8e1a02cfe52f 100644
--- a/accessible/generic/DocAccessible.cpp
+++ b/accessible/generic/DocAccessible.cpp
@@ -6,7 +6,6 @@
 #include "Accessible-inl.h"
 #include "AccIterator.h"
 #include "DocAccessible-inl.h"
-#include "DocAccessibleChild.h"
 #include "HTMLImageMapAccessible.h"
 #include "nsAccCache.h"
 #include "nsAccessiblePivot.h"
@@ -84,7 +83,7 @@ DocAccessible::
   mScrollPositionChangedTicks(0),
   mLoadState(eTreeConstructionPending), mDocFlags(0), mLoadEventType(0),
   mVirtualCursor(nullptr),
-  mPresShell(aPresShell), mIPCDoc(nullptr)
+  mPresShell(aPresShell)
 {
   mGenericTypes |= eDocument;
   mStateFlags |= eNotNodeMapEntry;
@@ -474,12 +473,6 @@ DocAccessible::Shutdown()
 
   mChildDocuments.Clear();
 
-  // XXX thinking about ordering?
-  if (XRE_GetProcessType() != GeckoProcessType_Default) {
-    DocAccessibleChild::Send__delete__(mIPCDoc);
-    MOZ_ASSERT(!mIPCDoc);
-  }
-
   if (mVirtualCursor) {
     mVirtualCursor->RemoveObserver(this);
     mVirtualCursor = nullptr;
@@ -1443,13 +1436,6 @@ DocAccessible::DoInitialUpdate()
     nsRefPtr<AccReorderEvent> reorderEvent = new AccReorderEvent(Parent());
     ParentDocument()->FireDelayedEvent(reorderEvent);
   }
-
-  uint32_t childCount = ChildCount();
-  for (uint32_t i = 0; i < childCount; i++) {
-    Accessible* child = GetChildAt(i);
-    nsRefPtr<AccShowEvent> event = new AccShowEvent(child, child->GetContent());
-  FireDelayedEvent(event);
-  }
 }
 
 void
diff --git a/accessible/generic/DocAccessible.h b/accessible/generic/DocAccessible.h
index 42b655e69a55..4d7858c1cfa0 100644
--- a/accessible/generic/DocAccessible.h
+++ b/accessible/generic/DocAccessible.h
@@ -33,7 +33,6 @@ namespace a11y {
 
 class DocManager;
 class NotificationController;
-class DocAccessibleChild;
 class RelatedAccIterator;
 template<class Class, class Arg>
 class TNotification;
@@ -520,20 +519,6 @@ protected:
    */
   bool IsLoadEventTarget() const;
 
-  /**
-   * If this document is in a content process return the object responsible for
-   * communicating with the main process for it.
-   */
-  DocAccessibleChild* IPCDoc() const { return mIPCDoc; }
-
-  /*
-   * Set the object responsible for communicating with the main process on
-   * behalf of this document.
-   */
-  void SetIPCDoc(DocAccessibleChild* aIPCDoc) { mIPCDoc = aIPCDoc; }
-
-  friend class DocAccessibleChild;
-
   /**
    * Used to fire scrolling end event after page scroll.
    *
@@ -657,9 +642,6 @@ protected:
 private:
 
   nsIPresShell* mPresShell;
-
-  // Exclusively owned by IPDL so don't manually delete it!
-  DocAccessibleChild* mIPCDoc;
 };
 
 inline DocAccessible*
diff --git a/accessible/generic/moz.build b/accessible/generic/moz.build
index 3b393c650fb6..236715bda01d 100644
--- a/accessible/generic/moz.build
+++ b/accessible/generic/moz.build
@@ -28,7 +28,6 @@ UNIFIED_SOURCES += [
 LOCAL_INCLUDES += [
     '/accessible/base',
     '/accessible/html',
-    '/accessible/ipc',
     '/accessible/xpcom',
     '/accessible/xul',
     '/content/base/src',
@@ -55,5 +54,3 @@ else:
     ]
 
 FINAL_LIBRARY = 'xul'
-
-include('/ipc/chromium/chromium-config.mozbuild')
diff --git a/accessible/ipc/DocAccessibleChild.cpp b/accessible/ipc/DocAccessibleChild.cpp
deleted file mode 100644
index 5070b1fe9739..000000000000
--- a/accessible/ipc/DocAccessibleChild.cpp
+++ /dev/null
@@ -1,40 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set ts=2 et sw=2 tw=80: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "DocAccessibleChild.h"
-
-#include "Accessible-inl.h"
-
-namespace mozilla {
-namespace a11y {
-
-void
-SerializeTree(Accessible* aRoot, nsTArray<AccessibleData>& aTree)
-{
-  uint64_t id = reinterpret_cast<uint64_t>(aRoot->UniqueID());
-  uint32_t role = aRoot->Role();
-  uint32_t childCount = aRoot->ChildCount();
-
-  nsString name;
-  aRoot->Name(name);
-  aTree.AppendElement(AccessibleData(id, role, childCount, name));
-  for (uint32_t i = 0; i < childCount; i++)
-    SerializeTree(aRoot->GetChildAt(i), aTree);
-}
-
-void
-DocAccessibleChild::ShowEvent(AccShowEvent* aShowEvent)
-{
-  Accessible* parent = aShowEvent->Parent();
-  uint64_t parentID = parent->IsDoc() ? 0 : reinterpret_cast<uint64_t>(parent->UniqueID());
-  uint32_t idxInParent = aShowEvent->GetAccessible()->IndexInParent();
-  nsTArray<AccessibleData> shownTree;
-  ShowEventData data(parentID, idxInParent, shownTree);
-  SerializeTree(aShowEvent->GetAccessible(), data.NewTree());
-  SendShowEvent(data);
-}
-}
-}
diff --git a/accessible/ipc/DocAccessibleChild.h b/accessible/ipc/DocAccessibleChild.h
deleted file mode 100644
index 50fdcc7cfd1f..000000000000
--- a/accessible/ipc/DocAccessibleChild.h
+++ /dev/null
@@ -1,43 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set ts=2 et sw=2 tw=80: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef mozilla_a11y_DocAccessibleChild_h
-#define mozilla_a11y_DocAccessibleChild_h
-
-#include "mozilla/a11y/DocAccessible.h"
-#include "mozilla/a11y/PDocAccessibleChild.h"
-#include "nsISupportsImpl.h"
-
-namespace mozilla {
-namespace a11y {
-class AccShowEvent;
-
-  /*
-   * These objects handle content side communication for an accessible document,
-   * and their lifetime is the same as the document they represent.
-   */
-class DocAccessibleChild : public PDocAccessibleChild
-{
-public:
-  DocAccessibleChild(DocAccessible* aDoc) :
-    mDoc(aDoc)
-  { MOZ_COUNT_CTOR(DocAccessibleChild); }
-  ~DocAccessibleChild()
-  {
-    mDoc->SetIPCDoc(nullptr);
-    MOZ_COUNT_DTOR(DocAccessibleChild);
-  }
-
-  void ShowEvent(AccShowEvent* aShowEvent);
-
-private:
-  DocAccessible* mDoc;
-};
-
-}
-}
-
-#endif
diff --git a/accessible/ipc/DocAccessibleParent.cpp b/accessible/ipc/DocAccessibleParent.cpp
deleted file mode 100644
index 0a60f6ddbee2..000000000000
--- a/accessible/ipc/DocAccessibleParent.cpp
+++ /dev/null
@@ -1,112 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set ts=2 et sw=2 tw=80: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "DocAccessibleParent.h"
-#include "nsAutoPtr.h"
-#include "mozilla/a11y/Platform.h"
-
-namespace mozilla {
-namespace a11y {
-
-bool
-DocAccessibleParent::RecvShowEvent(const ShowEventData& aData)
-{
-  if (aData.NewTree().IsEmpty()) {
-    NS_ERROR("no children being added");
-    return false;
-  }
-
-  ProxyAccessible* parent = nullptr;
-  if (aData.ID()) {
-    ProxyEntry* e = mAccessibles.GetEntry(aData.ID());
-    if (e)
-      parent = e->mProxy;
-  } else {
-    parent = this;
-  }
-
-  // XXX This should really never happen, but sometimes we fail to fire the
-  // required show events.
-  if (!parent) {
-    NS_ERROR("adding child to unknown accessible");
-    return false;
-  }
-
-  uint32_t newChildIdx = aData.Idx();
-  if (newChildIdx > parent->ChildrenCount()) {
-    NS_ERROR("invalid index to add child at");
-    return false;
-  }
-
-  uint32_t consumed = AddSubtree(parent, aData.NewTree(), 0, newChildIdx);
-  MOZ_ASSERT(consumed == aData.NewTree().Length());
-  for (uint32_t i = 0; i < consumed; i++) {
-    uint64_t id = aData.NewTree()[i].ID();
-    MOZ_ASSERT(mAccessibles.GetEntry(id));
-  }
-
-  return consumed;
-}
-
-uint32_t
-DocAccessibleParent::AddSubtree(ProxyAccessible* aParent,
-                                const nsTArray<a11y::AccessibleData>& aNewTree,
-                                uint32_t aIdx, uint32_t aIdxInParent)
-{
-  if (aNewTree.Length() <= aIdx) {
-    NS_ERROR("bad index in serialized tree!");
-    return 0;
-  }
-
-  const AccessibleData& newChild = aNewTree[aIdx];
-  if (newChild.Role() > roles::LAST_ROLE) {
-    NS_ERROR("invalid role");
-    return 0;
-  }
-
-  auto role = static_cast<a11y::role>(newChild.Role());
-  ProxyAccessible* newProxy =
-    new ProxyAccessible(newChild.ID(), aParent, this, role, newChild.Name());
-  aParent->AddChildAt(aIdxInParent, newProxy);
-  mAccessibles.PutEntry(newChild.ID())->mProxy = newProxy;
-  ProxyCreated(newProxy);
-
-  uint32_t accessibles = 1;
-  uint32_t kids = newChild.ChildrenCount();
-  for (uint32_t i = 0; i < kids; i++) {
-    uint32_t consumed = AddSubtree(newProxy, aNewTree, aIdx + accessibles, i);
-    if (!consumed)
-      return 0;
-
-    accessibles += consumed;
-  }
-
-  MOZ_ASSERT(newProxy->ChildrenCount() == kids);
-
-  return accessibles;
-}
-
-bool
-DocAccessibleParent::RecvHideEvent(const uint64_t& aRootID)
-{
-  ProxyEntry* rootEntry = mAccessibles.GetEntry(aRootID);
-  if (!rootEntry) {
-    NS_ERROR("invalid root being removed!");
-    return true;
-  }
-
-  ProxyAccessible* root = rootEntry->mProxy;
-  if (!root) {
-    NS_ERROR("invalid root being removed!");
-    return true;
-  }
-
-  root->Shutdown();
-
-  return true;
-}
-}
-}
diff --git a/accessible/ipc/DocAccessibleParent.h b/accessible/ipc/DocAccessibleParent.h
deleted file mode 100644
index b92a5e0ac127..000000000000
--- a/accessible/ipc/DocAccessibleParent.h
+++ /dev/null
@@ -1,141 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set ts=2 et sw=2 tw=80: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef mozilla_a11y_DocAccessibleParent_h
-#define mozilla_a11y_DocAccessibleParent_h
-
-#include "nsAccessibilityService.h"
-#include "ProxyAccessible.h"
-#include "mozilla/a11y/PDocAccessibleParent.h"
-#include "nsClassHashtable.h"
-#include "nsHashKeys.h"
-#include "nsISupportsImpl.h"
-
-namespace mozilla {
-namespace a11y {
-
-/*
- * These objects live in the main process and comunicate with and represent
- * an accessible document in a content process.
- */
-class DocAccessibleParent : public ProxyAccessible,
-    public PDocAccessibleParent
-{
-public:
-  DocAccessibleParent() :
-    mParentDoc(nullptr)
-  { MOZ_COUNT_CTOR_INHERITED(DocAccessibleParent, ProxyAccessible); }
-  ~DocAccessibleParent()
-  {
-    MOZ_COUNT_DTOR_INHERITED(DocAccessibleParent, ProxyAccessible);
-    MOZ_ASSERT(mChildDocs.Length() == 0);
-    MOZ_ASSERT(!mParentDoc);
-  }
-
-  /*
-   * Called when a message from a document in a child process notifies the main
-   * process it is firing an event.
-   */
-  virtual bool RecvEvent(const uint32_t& aType) MOZ_OVERRIDE
-  {
-    return true;
-  }
-
-  virtual bool RecvShowEvent(const ShowEventData& aData) MOZ_OVERRIDE;
-  virtual bool RecvHideEvent(const uint64_t& aRootID) MOZ_OVERRIDE;
-
-  virtual void ActorDestroy(ActorDestroyReason aWhy) MOZ_OVERRIDE
-  {
-    MOZ_ASSERT(mChildDocs.IsEmpty(),
-               "why wheren't the child docs destroyed already?");
-    mParentDoc ? mParentDoc->RemoveChildDoc(this)
-      : GetAccService()->RemoteDocShutdown(this);
-  }
-
-  /*
-   * Return the main processes representation of the parent document (if any)
-   * of the document this object represents.
-   */
-  DocAccessibleParent* Parent() const { return mParentDoc; }
-
-  /*
-   * Called when a document in a content process notifies the main process of a
-   * new child document.
-   */
-  bool AddChildDoc(DocAccessibleParent* aChildDoc, uint64_t aParentID)
-  {
-    ProxyAccessible* outerDoc = mAccessibles.GetEntry(aParentID)->mProxy;
-    if (!outerDoc)
-      return false;
-
-    aChildDoc->mParent = outerDoc;
-    outerDoc->SetChildDoc(aChildDoc);
-    mChildDocs.AppendElement(aChildDoc);
-    aChildDoc->mParentDoc = this;
-    return true;
-  }
-
-  /*
-   * Called when the document in the content process this object represents
-   * notifies the main process a child document has been removed.
-   */
-  void RemoveChildDoc(DocAccessibleParent* aChildDoc)
-  {
-    aChildDoc->mParent->SetChildDoc(nullptr);
-    mChildDocs.RemoveElement(aChildDoc);
-    aChildDoc->mParentDoc = nullptr;
-    MOZ_ASSERT(aChildDoc->mChildDocs.Length() == 0);
-  }
-
-  void RemoveAccessible(ProxyAccessible* aAccessible)
-  {
-    MOZ_ASSERT(mAccessibles.GetEntry(aAccessible->ID()));
-    mAccessibles.RemoveEntry(aAccessible->ID());
-  }
-
-private:
-
-  class ProxyEntry : public PLDHashEntryHdr
-  {
-  public:
-    ProxyEntry(const void*) : mProxy(nullptr) {}
-    ProxyEntry(ProxyEntry&& aOther) :
-      mProxy(aOther.mProxy) { aOther.mProxy = nullptr; }
-    ~ProxyEntry() { delete mProxy; }
-
-    typedef uint64_t KeyType;
-    typedef const void* KeyTypePointer;
-
-    bool KeyEquals(const void* aKey) const
-    { return mProxy->ID() == (uint64_t)aKey; }
-
-    static const void* KeyToPointer(uint64_t aKey) { return (void*)aKey; }
-
-    static PLDHashNumber HashKey(const void* aKey) { return (uint64_t)aKey; }
-
-    enum { ALLOW_MEMMOVE = true };
-
-    ProxyAccessible* mProxy;
-  };
-
-  uint32_t AddSubtree(ProxyAccessible* aParent,
-                      const nsTArray<AccessibleData>& aNewTree, uint32_t aIdx,
-                      uint32_t aIdxInParent);
-
-  nsTArray<DocAccessibleParent*> mChildDocs;
-  DocAccessibleParent* mParentDoc;
-
-  /*
-   * Conceptually this is a map from IDs to proxies, but we store the ID in the
-   * proxy object so we can't use a real map.
-   */
-  nsTHashtable<ProxyEntry> mAccessibles;
-};
-
-}
-}
-
-#endif
diff --git a/accessible/ipc/PDocAccessible.ipdl b/accessible/ipc/PDocAccessible.ipdl
deleted file mode 100644
index b3328b31b680..000000000000
--- a/accessible/ipc/PDocAccessible.ipdl
+++ /dev/null
@@ -1,44 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set ts=2 et sw=2 tw=80: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-include protocol PContent;
-
-namespace mozilla {
-namespace a11y {
-
-struct AccessibleData
-{
-  uint64_t ID;
-  uint32_t Role;
-  uint32_t ChildrenCount;
-  nsString Name;
-};
-
-struct ShowEventData
-{
-  uint64_t ID;
-  uint32_t Idx;
-  AccessibleData[] NewTree;
-};
-
-protocol PDocAccessible
-{
-  manager PContent;
-
-parent:
-  __delete__();
-
-  /*
-   * Notify the parent process the document in the child process is firing an
-   * event.
-   */
-  Event(uint32_t type);
-  ShowEvent(ShowEventData data);
-  HideEvent(uint64_t aRootID);
-};
-
-}
-}
diff --git a/accessible/ipc/ProxyAccessible.cpp b/accessible/ipc/ProxyAccessible.cpp
deleted file mode 100644
index 5af1aa41d8fb..000000000000
--- a/accessible/ipc/ProxyAccessible.cpp
+++ /dev/null
@@ -1,42 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set ts=2 et sw=2 tw=80: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "ProxyAccessible.h"
-#include "DocAccessibleParent.h"
-#include "mozilla/a11y/Platform.h"
-
-namespace mozilla {
-namespace a11y {
-
-void
-ProxyAccessible::Shutdown()
-{
-  MOZ_ASSERT(!mOuterDoc);
-
-  uint32_t childCount = mChildren.Length();
-  for (uint32_t idx = 0; idx < childCount; idx++)
-    mChildren[idx]->Shutdown();
-
-  mChildren.Clear();
-  ProxyDestroyed(this);
-  mDoc->RemoveAccessible(this);
-}
-
-void
-ProxyAccessible::SetChildDoc(DocAccessibleParent* aParent)
-{
-  if (aParent) {
-    MOZ_ASSERT(mChildren.IsEmpty());
-    mChildren.AppendElement(aParent);
-    mOuterDoc = true;
-  } else {
-    MOZ_ASSERT(mChildren.Length() == 1);
-    mChildren.Clear();
-    mOuterDoc = false;
-  }
-}
-}
-}
diff --git a/accessible/ipc/ProxyAccessible.h b/accessible/ipc/ProxyAccessible.h
deleted file mode 100644
index 39fd379d1e24..000000000000
--- a/accessible/ipc/ProxyAccessible.h
+++ /dev/null
@@ -1,77 +0,0 @@
-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set ts=2 et sw=2 tw=80: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef mozilla_a11y_ProxyAccessible_h
-#define mozilla_a11y_ProxyAccessible_h
-
-#include "mozilla/a11y/Role.h"
-#include "nsString.h"
-#include "nsTArray.h"
-
-namespace mozilla {
-namespace a11y {
-
-class DocAccessibleParent;
-
-class ProxyAccessible
-{
-public:
-
-  ProxyAccessible(uint64_t aID, ProxyAccessible* aParent,
-                  DocAccessibleParent* aDoc, role aRole,
-                  const nsString& aName) :
-     mParent(aParent), mDoc(aDoc), mID(aID), mRole(aRole), mOuterDoc(false), mName(aName)
-  {
-    MOZ_COUNT_CTOR(ProxyAccessible);
-  }
-  ~ProxyAccessible() { MOZ_COUNT_DTOR(ProxyAccessible); }
-
-  void AddChildAt(uint32_t aIdx, ProxyAccessible* aChild)
-  { mChildren.InsertElementAt(aIdx, aChild); }
-
-  uint32_t ChildrenCount() const { return mChildren.Length(); }
-
-  void Shutdown();
-
-  void SetChildDoc(DocAccessibleParent*);
-
-  /**
-   * Get the role of the accessible we're proxying.
-   */
-  role Role() const { return mRole; }
-
-  /**
-   * Allow the platform to store a pointers worth of data on us.
-   */
-  uintptr_t GetWrapper() const { return mWrapper; }
-  void SetWrapper(uintptr_t aWrapper) { mWrapper = aWrapper; }
-
-  /*
-   * Return the ID of the accessible being proxied.
-   */
-  uint64_t ID() const { return mID; }
-
-protected:
-  ProxyAccessible() :
-    mParent(nullptr), mDoc(nullptr) { MOZ_COUNT_CTOR(ProxyAccessible); }
-
-protected:
-  ProxyAccessible* mParent;
-
-private:
-  nsTArray<ProxyAccessible*> mChildren;
-  DocAccessibleParent* mDoc;
-  uintptr_t mWrapper;
-  uint64_t mID;
-  role mRole : 31;
-  bool mOuterDoc : 1;
-  nsString mName;
-};
-
-}
-}
-
-#endif
diff --git a/accessible/ipc/moz.build b/accessible/ipc/moz.build
deleted file mode 100644
index 64a45e9980eb..000000000000
--- a/accessible/ipc/moz.build
+++ /dev/null
@@ -1,28 +0,0 @@
-# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
-# vim: set filetype=python:
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-IPDL_SOURCES += ['PDocAccessible.ipdl']
-
-EXPORTS.mozilla.a11y += [
-    'DocAccessibleChild.h',
-    'DocAccessibleParent.h',
-    'ProxyAccessible.h'
-]
-
-SOURCES += [
-    'DocAccessibleChild.cpp',
-    'DocAccessibleParent.cpp',
-    'ProxyAccessible.cpp'
-]
-
-LOCAL_INCLUDES += [
-    '../base',
-    '../generic',
-    ]
-
-FINAL_LIBRARY = 'xul'
-
-include('/ipc/chromium/chromium-config.mozbuild')
diff --git a/accessible/mac/Platform.mm b/accessible/mac/Platform.mm
index 4d82f2c5e836..98bbac02a9b9 100644
--- a/accessible/mac/Platform.mm
+++ b/accessible/mac/Platform.mm
@@ -33,15 +33,6 @@ PlatformShutdown()
 {
 }
 
-void
-ProxyCreated(ProxyAccessible*)
-{
-}
-
-void
-ProxyDestroyed(ProxyAccessible*)
-{
-}
 }
 }
 
diff --git a/accessible/moz.build b/accessible/moz.build
index 993d2202937f..44f345780018 100644
--- a/accessible/moz.build
+++ b/accessible/moz.build
@@ -15,7 +15,7 @@ elif toolkit == 'cocoa':
 else:
     DIRS += ['other']
 
-DIRS += ['base', 'generic', 'html', 'interfaces', 'ipc', 'jsat', 'xpcom']
+DIRS += ['base', 'generic', 'html', 'interfaces', 'jsat', 'xpcom']
 
 if CONFIG['MOZ_XUL']:
     DIRS += ['xul']
diff --git a/accessible/other/Platform.cpp b/accessible/other/Platform.cpp
index 768f687c738c..87c9fc6071f8 100644
--- a/accessible/other/Platform.cpp
+++ b/accessible/other/Platform.cpp
@@ -18,13 +18,3 @@ void
 a11y::PlatformShutdown()
 {
 }
-
-void
-a11y::ProxyCreated(ProxyAccessible*)
-{
-}
-
-void
-a11y::ProxyDestroyed(ProxyAccessible*)
-{
-}
diff --git a/accessible/windows/msaa/Platform.cpp b/accessible/windows/msaa/Platform.cpp
index 0ed1f5ffc073..263eb1a4d130 100644
--- a/accessible/windows/msaa/Platform.cpp
+++ b/accessible/windows/msaa/Platform.cpp
@@ -34,12 +34,3 @@ a11y::PlatformShutdown()
   nsWinUtils::ShutdownWindowEmulation();
 }
 
-void
-a11y::ProxyCreated(ProxyAccessible*)
-{
-}
-
-void
-a11y::ProxyDestroyed(ProxyAccessible*)
-{
-}
diff --git a/dom/ipc/ContentChild.cpp b/dom/ipc/ContentChild.cpp
index 6810cfe101ec..4480f01df41e 100644
--- a/dom/ipc/ContentChild.cpp
+++ b/dom/ipc/ContentChild.cpp
@@ -19,7 +19,6 @@
 #include "TabChild.h"
 
 #include "mozilla/Attributes.h"
-#include "mozilla/a11y/DocAccessibleChild.h"
 #include "mozilla/Preferences.h"
 #include "mozilla/dom/ContentBridgeChild.h"
 #include "mozilla/dom/ContentBridgeParent.h"
@@ -708,20 +707,6 @@ ContentChild::InitXPCOM()
     InitOnContentProcessCreated();
 }
 
-a11y::PDocAccessibleChild*
-ContentChild::AllocPDocAccessibleChild(PDocAccessibleChild*, const uint64_t&)
-{
-  MOZ_ASSERT(false, "should never call this!");
-  return nullptr;
-}
-
-bool
-ContentChild::DeallocPDocAccessibleChild(a11y::PDocAccessibleChild* aChild)
-{
-  delete static_cast<mozilla::a11y::DocAccessibleChild*>(aChild);
-  return true;
-}
-
 PMemoryReportRequestChild*
 ContentChild::AllocPMemoryReportRequestChild(const uint32_t& aGeneration,
                                              const bool &aAnonymize,
diff --git a/dom/ipc/ContentChild.h b/dom/ipc/ContentChild.h
index 97738af734c5..ef8187543c75 100644
--- a/dom/ipc/ContentChild.h
+++ b/dom/ipc/ContentChild.h
@@ -380,8 +380,6 @@ public:
                                          const uint64_t& aID,
                                          const bool& aIsForApp,
                                          const bool& aIsForBrowser) MOZ_OVERRIDE;
-    virtual PDocAccessibleChild* AllocPDocAccessibleChild(PDocAccessibleChild*, const uint64_t&) MOZ_OVERRIDE;
-    virtual bool DeallocPDocAccessibleChild(PDocAccessibleChild*) MOZ_OVERRIDE;
 
 private:
     virtual void ActorDestroy(ActorDestroyReason why) MOZ_OVERRIDE;
diff --git a/dom/ipc/ContentParent.cpp b/dom/ipc/ContentParent.cpp
index 4b38a0ba065e..316ba9cd2abd 100755
--- a/dom/ipc/ContentParent.cpp
+++ b/dom/ipc/ContentParent.cpp
@@ -30,8 +30,6 @@
 #include "CrashReporterParent.h"
 #include "IHistory.h"
 #include "mozIApplication.h"
-#include "mozilla/a11y/DocAccessibleParent.h"
-#include "nsAccessibilityService.h"
 #include "mozilla/ClearOnShutdown.h"
 #include "mozilla/dom/DataStoreService.h"
 #include "mozilla/dom/DOMStorageIPC.h"
@@ -2699,34 +2697,6 @@ ContentParent::Observe(nsISupports* aSubject,
     return NS_OK;
 }
 
-  a11y::PDocAccessibleParent*
-ContentParent::AllocPDocAccessibleParent(PDocAccessibleParent* aParent, const uint64_t&)
-{
-  return new a11y::DocAccessibleParent();
-}
-
-bool
-ContentParent::DeallocPDocAccessibleParent(PDocAccessibleParent* aParent)
-{
-  delete static_cast<a11y::DocAccessibleParent*>(aParent);
-  return true;
-}
-
-bool
-ContentParent::RecvPDocAccessibleConstructor(PDocAccessibleParent* aDoc, PDocAccessibleParent* aParentDoc, const uint64_t& aParentID)
-{
-  auto doc = static_cast<a11y::DocAccessibleParent*>(aDoc);
-  if (aParentDoc) {
-    MOZ_ASSERT(aParentID);
-    auto parentDoc = static_cast<a11y::DocAccessibleParent*>(aParentDoc);
-    return parentDoc->AddChildDoc(doc, aParentID);
-  } else {
-    MOZ_ASSERT(!aParentID);
-    GetAccService()->RemoteDocAdded(doc);
-  }
-  return true;
-}
-
 PCompositorParent*
 ContentParent::AllocPCompositorParent(mozilla::ipc::Transport* aTransport,
                                       base::ProcessId aOtherProcess)
diff --git a/dom/ipc/ContentParent.h b/dom/ipc/ContentParent.h
index e59035b41a3f..0a10f29858aa 100644
--- a/dom/ipc/ContentParent.h
+++ b/dom/ipc/ContentParent.h
@@ -666,11 +666,6 @@ private:
                           int32_t* aSliceRefCnt,
                           bool* aResult) MOZ_OVERRIDE;
 
-    virtual PDocAccessibleParent* AllocPDocAccessibleParent(PDocAccessibleParent*, const uint64_t&) MOZ_OVERRIDE;
-    virtual bool DeallocPDocAccessibleParent(PDocAccessibleParent*) MOZ_OVERRIDE;
-    virtual bool RecvPDocAccessibleConstructor(PDocAccessibleParent* aDoc,
-                                               PDocAccessibleParent* aParentDoc, const uint64_t& aParentID) MOZ_OVERRIDE;
-
     // If you add strong pointers to cycle collected objects here, be sure to
     // release these objects in ShutDownProcess.  See the comment there for more
     // details.
diff --git a/dom/ipc/PContent.ipdl b/dom/ipc/PContent.ipdl
index deb3e87721dd..6f0d4118871e 100644
--- a/dom/ipc/PContent.ipdl
+++ b/dom/ipc/PContent.ipdl
@@ -14,7 +14,6 @@ include protocol PCompositor;
 include protocol PContentBridge;
 include protocol PCycleCollectWithLogs;
 include protocol PCrashReporter;
-include protocol PDocAccessible;
 include protocol PExternalHelperApp;
 include protocol PDeviceStorageRequest;
 include protocol PFileDescriptorSet;
@@ -333,7 +332,6 @@ intr protocol PContent
     manages PCellBroadcast;
     manages PCrashReporter;
     manages PCycleCollectWithLogs;
-    manages PDocAccessible;
     manages PDeviceStorageRequest;
     manages PFileSystemRequest;
     manages PExternalHelperApp;
@@ -490,14 +488,6 @@ child:
     OnAppThemeChanged();
 
 parent:
-    /**
-     * Tell the parent process a new accessible document has been created.
-     * aParentDoc is the accessible document it was created in if any, and
-     * aParentAcc is the id of the accessible in that document the new document
-     * is a child of.
-     */
-    PDocAccessible(nullable PDocAccessible aParentDoc, uint64_t aParentAcc);
-
     /**
      * Tell the content process some attributes of itself.  This is
      * among the first information queried by content processes after