Invert the owning relationship between WebFrame and Frame.

Source/core/loader/EmptyClients.h

Index: Source/core/loader/EmptyClients.h
diff --git a/Source/core/loader/EmptyClients.h b/Source/core/loader/EmptyClients.h
index 6c70a77881d6e4f17415bdb1f4b4f78907cca7f5..4fcca4373737e0027365de3dcd276ad2ea48ed87 100644
--- a/Source/core/loader/EmptyClients.h
+++ b/Source/core/loader/EmptyClients.h
@@ -186,10 +186,10 @@ class EmptyFrameLoaderClient : public FrameLoaderClient {
 public:
     EmptyFrameLoaderClient() { }
     virtual ~EmptyFrameLoaderClient() {  }
-    virtual void frameLoaderDestroyed() OVERRIDE { }
 
     virtual bool hasWebView() const OVERRIDE { return true; } // mainly for assertions
 
+    virtual void willDetachParent() OVERRIDE { }
     virtual void detachedFromParent() OVERRIDE { }
 
     virtual void dispatchWillSendRequest(DocumentLoader*, unsigned long, ResourceRequest&, const ResourceResponse&) OVERRIDE { }