diff --git a/content/events/src/nsDOMNotifyPaintEvent.cpp b/content/events/src/nsDOMNotifyPaintEvent.cpp
index 2886af165232..97f316537c9b 100644
--- a/content/events/src/nsDOMNotifyPaintEvent.cpp
+++ b/content/events/src/nsDOMNotifyPaintEvent.cpp
@@ -92,7 +92,7 @@ nsDOMNotifyPaintEvent::ClientRects()
 }
 
 NS_IMETHODIMP
-nsDOMNotifyPaintEvent::GetPaintRequests(nsIDOMPaintRequestList** aResult)
+nsDOMNotifyPaintEvent::GetPaintRequests(nsISupports** aResult)
 {
   nsRefPtr<nsPaintRequestList> requests = PaintRequests();
   requests.forget(aResult);
diff --git a/content/events/src/nsPaintRequest.cpp b/content/events/src/nsPaintRequest.cpp
index 015a5d1acae6..901609631273 100644
--- a/content/events/src/nsPaintRequest.cpp
+++ b/content/events/src/nsPaintRequest.cpp
@@ -55,31 +55,16 @@ nsPaintRequest::GetXPCOMReason(nsAString& aResult)
 
 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_1(nsPaintRequestList, mParent)
 
-NS_INTERFACE_TABLE_HEAD(nsPaintRequestList)
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsPaintRequestList)
   NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
-  NS_INTERFACE_TABLE1(nsPaintRequestList, nsIDOMPaintRequestList)
-  NS_INTERFACE_TABLE_TO_MAP_SEGUE_CYCLE_COLLECTION(nsPaintRequestList)
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
 NS_INTERFACE_MAP_END
 
 NS_IMPL_CYCLE_COLLECTING_ADDREF(nsPaintRequestList)
 NS_IMPL_CYCLE_COLLECTING_RELEASE(nsPaintRequestList)
 
 JSObject*
-nsPaintRequestList::WrapObject(JSContext *cx, JS::Handle<JSObject*> scope)
+nsPaintRequestList::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aScope)
 {
-  return mozilla::dom::PaintRequestListBinding::Wrap(cx, scope, this);
-}
-
-NS_IMETHODIMP    
-nsPaintRequestList::GetLength(uint32_t* aLength)
-{
-  *aLength = Length();
-  return NS_OK;
-}
-
-NS_IMETHODIMP    
-nsPaintRequestList::Item(uint32_t aIndex, nsIDOMPaintRequest** aReturn)
-{
-  NS_IF_ADDREF(*aReturn = Item(aIndex));
-  return NS_OK;
+  return PaintRequestListBinding::Wrap(aCx, aScope, this);
 }
diff --git a/content/events/src/nsPaintRequest.h b/content/events/src/nsPaintRequest.h
index b3ba890d92fd..f1b8e4dfc9e8 100644
--- a/content/events/src/nsPaintRequest.h
+++ b/content/events/src/nsPaintRequest.h
@@ -7,7 +7,6 @@
 #define NSPAINTREQUEST_H_
 
 #include "nsIDOMPaintRequest.h"
-#include "nsIDOMPaintRequestList.h"
 #include "nsPresContext.h"
 #include "nsIDOMEvent.h"
 #include "mozilla/Attributes.h"
@@ -53,7 +52,7 @@ private:
   nsInvalidateRequestList::Request mRequest;
 };
 
-class nsPaintRequestList MOZ_FINAL : public nsIDOMPaintRequestList,
+class nsPaintRequestList MOZ_FINAL : public nsISupports,
                                      public nsWrapperCache
 {
 public:
@@ -64,10 +63,9 @@ public:
 
   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
   NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsPaintRequestList)
-  NS_DECL_NSIDOMPAINTREQUESTLIST
   
-  virtual JSObject* WrapObject(JSContext *cx,
-                               JS::Handle<JSObject*> scope) MOZ_OVERRIDE;
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aScope) MOZ_OVERRIDE;
   nsISupports* GetParentObject()
   {
     return mParent;
@@ -78,23 +76,6 @@ public:
     mArray.AppendElement(aElement);
   }
 
-  static nsPaintRequestList* FromSupports(nsISupports* aSupports)
-  {
-#ifdef DEBUG
-    {
-      nsCOMPtr<nsIDOMPaintRequestList> list_qi = do_QueryInterface(aSupports);
-
-      // If this assertion fires the QI implementation for the object in
-      // question doesn't use the nsIDOMClientRectList pointer as the nsISupports
-      // pointer. That must be fixed, or we'll crash...
-      NS_ASSERTION(list_qi == static_cast<nsIDOMPaintRequestList*>(aSupports),
-                   "Uh, fix QI!");
-    }
-#endif
-
-    return static_cast<nsPaintRequestList*>(aSupports);
-  }
-
   uint32_t Length()
   {
     return mArray.Length();
diff --git a/dom/interfaces/events/moz.build b/dom/interfaces/events/moz.build
index a03c15eb3885..72da456eb09b 100644
--- a/dom/interfaces/events/moz.build
+++ b/dom/interfaces/events/moz.build
@@ -40,7 +40,6 @@ XPIDL_SOURCES += [
     'nsIDOMNotifyPaintEvent.idl',
     'nsIDOMPageTransitionEvent.idl',
     'nsIDOMPaintRequest.idl',
-    'nsIDOMPaintRequestList.idl',
     'nsIDOMPopStateEvent.idl',
     'nsIDOMPopupBlockedEvent.idl',
     'nsIDOMProgressEvent.idl',
diff --git a/dom/interfaces/events/nsIDOMNotifyPaintEvent.idl b/dom/interfaces/events/nsIDOMNotifyPaintEvent.idl
index c1883f2fe2da..543f2c946407 100644
--- a/dom/interfaces/events/nsIDOMNotifyPaintEvent.idl
+++ b/dom/interfaces/events/nsIDOMNotifyPaintEvent.idl
@@ -12,7 +12,7 @@ interface nsIDOMPaintRequestList;
  * event, which fires at a window when painting has happened in
  * that window.
  */
-[scriptable, builtinclass, uuid(e3560df8-0926-48da-b13a-36d3938c95af)]
+[scriptable, builtinclass, uuid(ef68f0d5-5b55-4198-9e59-a5e2c57d3adc)]
 interface nsIDOMNotifyPaintEvent : nsIDOMEvent
 {
   /**
@@ -32,6 +32,6 @@ interface nsIDOMNotifyPaintEvent : nsIDOMEvent
    */
   readonly attribute nsIDOMClientRect boundingClientRect;
 
-  readonly attribute nsIDOMPaintRequestList paintRequests;
+  readonly attribute nsISupports /* PaintRequestList */ paintRequests;
 };
 
diff --git a/dom/interfaces/events/nsIDOMPaintRequestList.idl b/dom/interfaces/events/nsIDOMPaintRequestList.idl
deleted file mode 100644
index df0dce556f9d..000000000000
--- a/dom/interfaces/events/nsIDOMPaintRequestList.idl
+++ /dev/null
@@ -1,15 +0,0 @@
-/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* 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 "domstubs.idl"
-
-interface nsIDOMPaintRequest;
-
-[scriptable, uuid(1d6a6e10-e9f0-468b-b8e5-da39c945690e)]
-interface nsIDOMPaintRequestList : nsISupports
-{
-  readonly attribute unsigned long length;
-  nsIDOMPaintRequest        item(in unsigned long index);
-};