Move the Widget hierarchy to the Oilpan heap.

Source/core/loader/EmptyClients.h

 /*
  * Copyright (C) 2006 Eric Seidel (eric@webkit.org)
  * Copyright (C) 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2012 Samsung Electronics. 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
@@ skipping 211 matching lines @@
     virtual void transitionToCommittedForNewPage() override { }
 
     virtual bool navigateBackForward(int offset) const override { return false; }
     virtual void didDisplayInsecureContent() override { }
     virtual void didRunInsecureContent(SecurityOrigin*, const KURL&) override { }
     virtual void didDetectXSS(const KURL&, bool) override { }
     virtual void didDispatchPingLoader(const KURL&) override { }
     virtual void selectorMatchChanged(const Vector<String>&, const Vector<String>&) override { }
     virtual PassRefPtrWillBeRawPtr<LocalFrame> createFrame(const KURL&, const AtomicString&, HTMLFrameOwnerElement*) override;
     virtual PassOwnPtrWillBeRawPtr<PluginPlaceholder> createPluginPlaceholder(Document&, const KURL&, const Vector<String>& paramNames, const Vector<String>& paramValues, const String& mimeType, bool loadManually) override;
-    virtual PassRefPtr<Widget> createPlugin(HTMLPlugInElement*, const KURL&, const Vector<String>&, const Vector<String>&, const String&, bool, DetachedPluginPolicy) override;
+    virtual PassRefPtrWillBeRawPtr<Widget> createPlugin(HTMLPlugInElement*, const KURL&, const Vector<String>&, const Vector<String>&, const String&, bool, DetachedPluginPolicy) override;
     virtual bool canCreatePluginWithoutRenderer(const String& mimeType) const override { return false; }
-    virtual PassRefPtr<Widget> createJavaAppletWidget(HTMLAppletElement*, const KURL&, const Vector<String>&, const Vector<String>&) override;
+    virtual PassRefPtrWillBeRawPtr<Widget> createJavaAppletWidget(HTMLAppletElement*, const KURL&, const Vector<String>&, const Vector<String>&) override;
 
     virtual ObjectContentType objectContentType(const KURL&, const String&, bool) override { return ObjectContentType(); }
 
     virtual void dispatchDidClearWindowObjectInMainWorld() override { }
     virtual void documentElementAvailable() override { }
 
     virtual void didCreateScriptContext(v8::Handle<v8::Context>, int extensionGroup, int worldId) override { }
     virtual void willReleaseScriptContext(v8::Handle<v8::Context>, int worldId) override { }
     virtual bool allowScriptExtension(const String& extensionName, int extensionGroup, int worldId) override { return false; }
 
@@ skipping 91 matching lines @@
 public:
     virtual PassOwnPtr<StorageNamespace> createSessionStorageNamespace() override;
     virtual bool canAccessStorage(LocalFrame*, StorageType) const override { return false; }
 };
 
 void fillWithEmptyClients(Page::PageClients&);
 
 }
 
 #endif // EmptyClients_h