Move the Widget hierarchy to the Oilpan heap.

Source/core/loader/EmptyClients.cpp

 /*
  * Copyright (C) 2006 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 115 matching lines @@
 PassRefPtrWillBeRawPtr<LocalFrame> EmptyFrameLoaderClient::createFrame(const KURL&, const AtomicString&, HTMLFrameOwnerElement*)
 {
     return nullptr;
 }
 
 PassOwnPtrWillBeRawPtr<PluginPlaceholder> EmptyFrameLoaderClient::createPluginPlaceholder(Document&, const KURL&, const Vector<String>& paramNames, const Vector<String>& paramValues, const String& mimeType, bool loadManually)
 {
     return nullptr;
 }
 
-PassRefPtr<Widget> EmptyFrameLoaderClient::createPlugin(HTMLPlugInElement*, const KURL&, const Vector<String>&, const Vector<String>&, const String&, bool, DetachedPluginPolicy)
+PassRefPtrWillBeRawPtr<Widget> EmptyFrameLoaderClient::createPlugin(HTMLPlugInElement*, const KURL&, const Vector<String>&, const Vector<String>&, const String&, bool, DetachedPluginPolicy)
 {
     return nullptr;
 }
 
-PassRefPtr<Widget> EmptyFrameLoaderClient::createJavaAppletWidget(HTMLAppletElement*, const KURL&, const Vector<String>&, const Vector<String>&)
+PassRefPtrWillBeRawPtr<Widget> EmptyFrameLoaderClient::createJavaAppletWidget(HTMLAppletElement*, const KURL&, const Vector<String>&, const Vector<String>&)
 {
     return nullptr;
 }
 
 void EmptyTextCheckerClient::requestCheckingOfString(PassRefPtrWillBeRawPtr<TextCheckingRequest>)
 {
 }
 
 void EmptyFrameLoaderClient::didRequestAutocomplete(HTMLFormElement*)
 {
 }
 
 PassOwnPtr<blink::WebServiceWorkerProvider> EmptyFrameLoaderClient::createServiceWorkerProvider()
 {
     return nullptr;
 }
 
 PassOwnPtr<blink::WebApplicationCacheHost> EmptyFrameLoaderClient::createApplicationCacheHost(blink::WebApplicationCacheHostClient*)
 {
     return nullptr;
 }
 
 PassOwnPtr<StorageNamespace> EmptyStorageClient::createSessionStorageNamespace()
 {
     return nullptr;
 }
 
 }