Invert the owning relationship between WebFrame and Frame.

Source/core/loader/FrameLoaderClient.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Google Inc. 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 70 matching lines @@
     class SharedBuffer;
     class SharedWorkerRepositoryClient;
     class SocketStreamHandle;
     class SubstituteData;
     class Widget;
 
     class FrameLoaderClient {
     public:
         virtual ~FrameLoaderClient() { }
 
-        virtual void frameLoaderDestroyed() = 0;
-
         virtual bool hasWebView() const = 0; // mainly for assertions
 
+        virtual void willDetachParent() = 0;
         virtual void detachedFromParent() = 0;
 
         virtual void dispatchWillRequestAfterPreconnect(ResourceRequest&) { }
         virtual void dispatchWillSendRequest(DocumentLoader*, unsigned long identifier, ResourceRequest&, const ResourceResponse& redirectResponse) = 0;
         virtual void dispatchDidReceiveResponse(DocumentLoader*, unsigned long identifier, const ResourceResponse&) = 0;
         virtual void dispatchDidFinishLoading(DocumentLoader*, unsigned long identifier) = 0;
         virtual void dispatchDidLoadResourceFromMemoryCache(const ResourceRequest&, const ResourceResponse&) = 0;
 
         virtual void dispatchDidHandleOnloadEvents() = 0;
         virtual void dispatchDidReceiveServerRedirectForProvisionalLoad() = 0;
@@ skipping 123 matching lines @@
         virtual SharedWorkerRepositoryClient* sharedWorkerRepositoryClient() { return 0; }
 
         virtual void didStopAllLoaders() { }
 
         virtual bool isFrameLoaderClientImpl() const { return false; }
     };
 
 } // namespace WebCore
 
 #endif // FrameLoaderClient_h