Move the frame tree into the embedder.

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 161 matching lines @@
 };
 
 class EmptyFrameLoaderClient FINAL : public FrameLoaderClient {
     WTF_MAKE_NONCOPYABLE(EmptyFrameLoaderClient); WTF_MAKE_FAST_ALLOCATED;
 public:
     EmptyFrameLoaderClient() { }
     virtual ~EmptyFrameLoaderClient() {  }
 
     virtual bool hasWebView() const OVERRIDE { return true; } // mainly for assertions
 
+    virtual Frame* parent() const OVERRIDE { return 0; }
+    virtual Frame* top() const OVERRIDE { return 0; }
+    virtual Frame* previousSibling() const OVERRIDE { return 0; }
+    virtual Frame* nextSibling() const OVERRIDE { return 0; }
+    virtual Frame* firstChild() const OVERRIDE { return 0; }
+    virtual Frame* lastChild() const OVERRIDE { return 0; }
     virtual void detachedFromParent() OVERRIDE { }
 
     virtual void dispatchWillSendRequest(DocumentLoader*, unsigned long, ResourceRequest&, const ResourceResponse&) OVERRIDE { }
     virtual void dispatchDidReceiveResponse(DocumentLoader*, unsigned long, const ResourceResponse&) OVERRIDE { }
     virtual void dispatchDidFinishLoading(DocumentLoader*, unsigned long) OVERRIDE { }
     virtual void dispatchDidLoadResourceFromMemoryCache(const ResourceRequest&, const ResourceResponse&) OVERRIDE { }
 
     virtual void dispatchDidHandleOnloadEvents() OVERRIDE { }
     virtual void dispatchDidReceiveServerRedirectForProvisionalLoad() OVERRIDE { }
     virtual void dispatchWillClose() OVERRIDE { }
@@ skipping 135 matching lines @@
 public:
     virtual PassOwnPtr<StorageNamespace> createSessionStorageNamespace() OVERRIDE;
     virtual bool canAccessStorage(Frame*, StorageType) const OVERRIDE { return false; }
 };
 
 void fillWithEmptyClients(Page::PageClients&);
 
 }
 
 #endif // EmptyClients_h