diff --git a/content/base/public/nsDOMFile.h b/content/base/public/nsDOMFile.h
index 1cbcb78e347..f4c91a827f0 100644
--- a/content/base/public/nsDOMFile.h
+++ b/content/base/public/nsDOMFile.h
@@ -201,9 +201,6 @@ public:
 
   virtual nsresult GetInternalStream(nsIInputStream** aStream) = 0;
 
-  virtual nsresult
-  GetInternalUrl(nsIPrincipal* aPrincipal, nsAString& aURL) = 0;
-
   virtual int64_t GetFileId() = 0;
 
   virtual void AddFileInfo(indexedDB::FileInfo* aFileInfo) = 0;
@@ -336,8 +333,6 @@ public:
 
   virtual nsresult GetInternalStream(nsIInputStream** aStream) MOZ_OVERRIDE;
 
-  virtual nsresult GetInternalUrl(nsIPrincipal* aPrincipal, nsAString& aURL) MOZ_OVERRIDE;
-
   virtual int64_t GetFileId() MOZ_OVERRIDE;
 
   virtual void AddFileInfo(indexedDB::FileInfo* aFileInfo) MOZ_OVERRIDE;
diff --git a/content/base/public/nsIDOMFile.idl b/content/base/public/nsIDOMFile.idl
index b894276808d..6076a10bb3b 100644
--- a/content/base/public/nsIDOMFile.idl
+++ b/content/base/public/nsIDOMFile.idl
@@ -26,16 +26,13 @@ interface nsIURI;
 interface nsIPrincipal;
 interface nsIDOMBlob;
 
-[scriptable, builtinclass, uuid(b1723fac-4814-4429-82cb-dc54ba0d46d6)]
+[scriptable, builtinclass, uuid(6ef56697-7c9c-41ac-83df-e01c079fb1d1)]
 interface nsIDOMBlob : nsISupports
 {
   readonly attribute unsigned long long size;
   readonly attribute DOMString type;
 
   [noscript] readonly attribute nsIInputStream internalStream;
-  // The caller is responsible for releasing the internalUrl from the
-  // blob: protocol handler
-  [noscript] DOMString getInternalUrl(in nsIPrincipal principal);
 
   [optional_argc] nsIDOMBlob slice([optional] in long long start,
                                    [optional] in long long end,
diff --git a/content/base/src/nsDOMFile.cpp b/content/base/src/nsDOMFile.cpp
index 0b1fefa4add..1ab34fe4a9c 100644
--- a/content/base/src/nsDOMFile.cpp
+++ b/content/base/src/nsDOMFile.cpp
@@ -409,12 +409,6 @@ DOMFile::GetInternalStream(nsIInputStream** aStream)
  return mImpl->GetInternalStream(aStream);
 }
 
-NS_IMETHODIMP
-DOMFile::GetInternalUrl(nsIPrincipal* aPrincipal, nsAString& aURL)
-{
-  return mImpl->GetInternalUrl(aPrincipal, aURL);
-}
-
 NS_IMETHODIMP_(int64_t)
 DOMFile::GetFileId()
 {
@@ -594,22 +588,6 @@ DOMFileImplBase::GetInternalStream(nsIInputStream** aStream)
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 
-nsresult
-DOMFileImplBase::GetInternalUrl(nsIPrincipal* aPrincipal, nsAString& aURL)
-{
-  NS_ENSURE_STATE(aPrincipal);
-
-  nsCString url;
-  nsresult rv = nsBlobProtocolHandler::AddDataEntry(
-    NS_LITERAL_CSTRING(BLOBURI_SCHEME), this, aPrincipal, url);
-  if (NS_FAILED(rv)) {
-    return rv;
-  }
-
-  CopyASCIItoUTF16(url, aURL);
-  return NS_OK;
-}
-
 int64_t
 DOMFileImplBase::GetFileId()
 {