Move the Widget hierarchy to the Oilpan heap.

Source/core/frame/RemoteFrame.h

Index: Source/core/frame/RemoteFrame.h
diff --git a/Source/core/frame/RemoteFrame.h b/Source/core/frame/RemoteFrame.h
index c246f75371870068b229e0d9ece3f77a42f4c5f2..9f9312eb7a21b6513bef6e30936080ca670f803f 100644
--- a/Source/core/frame/RemoteFrame.h
+++ b/Source/core/frame/RemoteFrame.h
@@ -22,17 +22,19 @@ public:
     virtual void navigate(Document& originDocument, const KURL&, const Referrer&, bool lockBackForwardList) OVERRIDE;
     virtual void detach() OVERRIDE;
 
-    void setView(PassRefPtr<RemoteFrameView>);
+    void setView(PassRefPtrWillBeRawPtr<RemoteFrameView>);
     void createView();
 
     RemoteFrameView* view() const;
 
+    void trace(Visitor*) OVERRIDE;
+
 private:
     RemoteFrame(RemoteFrameClient*, FrameHost*, FrameOwner*);
 
     RemoteFrameClient* remoteFrameClient() const;
 
-    RefPtr<RemoteFrameView> m_view;
+    RefPtrWillBeMember<RemoteFrameView> m_view;
 };
 
 inline RemoteFrameView* RemoteFrame::view() const