diff --git a/dom/file/ipc/IPCBlob.ipdlh b/dom/file/ipc/IPCBlob.ipdlh
deleted file mode 100644
index 7097c3aa9b25..000000000000
--- a/dom/file/ipc/IPCBlob.ipdlh
+++ /dev/null
@@ -1,47 +0,0 @@
-/* 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 PChildToParentStream;
-include protocol PParentToChildStream;
-
-include IPCStream;
-include ProtocolTypes;
-
-using struct mozilla::void_t
-  from "ipc/IPCMessageUtils.h";
-
-namespace mozilla {
-namespace dom {
-
-// This contains any extra bit for making a File out of a Blob.
-struct IPCFile
-{
-  nsString name;
-  int64_t lastModified;
-  nsString DOMPath;
-};
-
-// Union for blob vs file.
-union IPCFileUnion
-{
-  // For Blob.
-  void_t;
-
-  // For File.
-  IPCFile;
-};
-
-struct IPCBlob
-{
-  nsString type;
-  uint64_t size;
-
-  IPCStream inputStream;
-
-  IPCFileUnion file;
-};
-
-} // namespace dom
-} // namespace mozilla
-
diff --git a/dom/file/ipc/IPCBlobUtils.cpp b/dom/file/ipc/IPCBlobUtils.cpp
deleted file mode 100644
index 20ace6526c3e..000000000000
--- a/dom/file/ipc/IPCBlobUtils.cpp
+++ /dev/null
@@ -1,118 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set ts=8 sts=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 "IPCBlobUtils.h"
-#include "mozilla/dom/IPCBlob.h"
-#include "prtime.h"
-
-namespace mozilla {
-namespace dom {
-namespace IPCBlobUtils {
-
-already_AddRefed<BlobImpl>
-Deserialize(const IPCBlob& aIPCBlob)
-{
-  nsCOMPtr<nsIInputStream> inputStream =
-    DeserializeIPCStream(aIPCBlob.inputStream());
-
-  RefPtr<BlobImpl> blobImpl;
-
-  if (aIPCBlob.file().type() == IPCFileUnion::Tvoid_t) {
-    blobImpl = StreamBlobImpl::Create(inputStream,
-                                      aIPCBlob.type(),
-                                      aIPCBlob.size());
-  } else {
-    const IPCFile& file = aIPCBlob.file().get_IPCFile();
-    blobImpl = StreamBlobImpl::Create(inputStream,
-                                      file.name(),
-                                      aIPCBlob.type(),
-                                      file.lastModified(),
-                                      aIPCBlob.size());
-    blobImpl->SetDOMPath(file.DOMPath());
-  }
-
-  return blobImpl.forget();
-}
-
-template<typename M>
-nsresult
-SerializeInternal(BlobImpl* aBlobImpl, M* aManager, IPCBlob& aIPCBlob)
-{
-  MOZ_ASSERT(aBlobImpl);
-
-  nsAutoString value;
-  aBlobImpl->GetType(value);
-  aIPCBlob.type() = value;
-
-  ErrorResult rv;
-  aIPCBlob.size() = aBlobImpl->GetSize(rv);
-  if (NS_WARN_IF(rv.Failed())) {
-    return rv.StealNSResult();
-  }
-
-  if (!aBlobImpl->IsFile()) {
-    aIPCBlob.file() = void_t();
-  } else {
-    IPCFile file;
-
-    aBlobImpl->GetName(value);
-    file.name() = value;
-
-    file.lastModified() = aBlobImpl->GetLastModified(rv) * PR_USEC_PER_MSEC;
-    if (NS_WARN_IF(rv.Failed())) {
-      return rv.StealNSResult();
-    }
-
-    aBlobImpl->GetDOMPath(value);
-    file.DOMPath() = value;
-
-    aIPCBlob.file() = file;
-  }
-
-  ErrorResult error;
-  nsCOMPtr<nsIInputStream> inputStream;
-  aBlobImpl->GetInternalStream(getter_AddRefs(inputStream), error);
-  if (NS_WARN_IF(error.Failed())) {
-    return error.StealNSResult();
-  }
-
-  AutoIPCStream ipcStream(true /* delayStart */);
-
-  if (!ipcStream.Serialize(inputStream, aManager)) {
-    return NS_ERROR_FAILURE;
-  }
-
-  aIPCBlob.inputStream() = ipcStream.TakeValue();
-  return NS_OK;
-}
-
-nsresult
-Serialize(BlobImpl* aBlobImpl, nsIContentChild* aManager, IPCBlob& aIPCBlob)
-{
-  return SerializeInternal(aBlobImpl, aManager, aIPCBlob);
-}
-
-nsresult
-Serialize(BlobImpl* aBlobImpl, PBackgroundChild* aManager, IPCBlob& aIPCBlob)
-{
-  return SerializeInternal(aBlobImpl, aManager, aIPCBlob);
-}
-
-nsresult
-Serialize(BlobImpl* aBlobImpl, nsIContentParent* aManager, IPCBlob& aIPCBlob)
-{
-  return SerializeInternal(aBlobImpl, aManager, aIPCBlob);
-}
-
-nsresult
-Serialize(BlobImpl* aBlobImpl, PBackgroundParent* aManager, IPCBlob& aIPCBlob)
-{
-  return SerializeInternal(aBlobImpl, aManager, aIPCBlob);
-}
-
-} // IPCBlobUtils namespace
-} // dom namespace
-} // mozilla namespace
diff --git a/dom/file/ipc/IPCBlobUtils.h b/dom/file/ipc/IPCBlobUtils.h
deleted file mode 100644
index 545185e230ee..000000000000
--- a/dom/file/ipc/IPCBlobUtils.h
+++ /dev/null
@@ -1,47 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set ts=8 sts=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_dom_IPCBlobUtils_h
-#define mozilla_dom_IPCBlobUtils_h
-
-#include "mozilla/dom/File.h"
-
-namespace mozilla {
-
-namespace ipc {
-class PBackgroundChild;
-class PBackgroundParent;
-}
-
-namespace dom {
-
-class nsIContentChild;
-class nsIContentParent;
-
-namespace IPCBlobUtils {
-
-already_AddRefed<BlobImpl>
-Deserialize(const IPCBlob& aIPCBlob);
-
-// These 4 methods serialize aBlobImpl into aIPCBlob using the right manager.
-
-nsresult
-Serialize(BlobImpl* aBlobImpl, nsIContentChild* aManager, IPCBlob& aIPCBlob);
-
-nsresult
-Serialize(BlobImpl* aBlobImpl, PBackgroundChild* aManager, IPCBlob& aIPCBlob);
-
-nsresult
-Serialize(BlobImpl* aBlobImpl, nsIContentParent* aManager, IPCBlob& aIPCBlob);
-
-nsresult
-Serialize(BlobImpl* aBlobImpl, PBackgroundParent* aManager, IPCBlob& aIPCBlob);
-
-} // IPCBlobUtils
-} // dom namespace
-} // mozilla namespace
-
-#endif // mozilla_dom_IPCBlobUtils_h
diff --git a/dom/file/ipc/moz.build b/dom/file/ipc/moz.build
index 2ff658c025ec..1857261726ec 100644
--- a/dom/file/ipc/moz.build
+++ b/dom/file/ipc/moz.build
@@ -12,19 +12,13 @@ EXPORTS.mozilla.dom.ipc += [
     'nsIRemoteBlob.h',
 ]
 
-EXPORTS.mozilla.dom += [
-    'IPCBlobUtils.h',
-]
-
 UNIFIED_SOURCES += [
     'Blob.cpp',
-    'IPCBlobUtils.cpp',
     'MemoryStreamParent.cpp',
 ]
 
 IPDL_SOURCES += [
     'BlobTypes.ipdlh',
-    'IPCBlob.ipdlh',
     'PBlob.ipdl',
     'PBlobStream.ipdl',
     'PMemoryStream.ipdl',