[NotLanded] Implement the fetching algorithm of the Web Manifest.

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 144 matching lines @@
     virtual void needTouchEvents(bool) OVERRIDE { }
     virtual void setTouchAction(TouchAction touchAction) OVERRIDE { };
 
     virtual void didAssociateFormControls(const WillBeHeapVector<RefPtrWillBeMember<Element> >&) OVERRIDE { }
 
     virtual void annotatedRegionsChanged() OVERRIDE { }
     virtual bool paintCustomOverhangArea(GraphicsContext*, const IntRect&, const IntRect&, const IntRect&) OVERRIDE { return false; }
     virtual String acceptLanguages() OVERRIDE;
 };
 
-class EmptyFrameLoaderClient FINAL : public FrameLoaderClient {
+class EmptyFrameLoaderClient : 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* opener() const OVERRIDE { return 0; }
     virtual void setOpener(Frame*) OVERRIDE { }
 
@@ skipping 156 matching lines @@
 public:
     virtual PassOwnPtr<StorageNamespace> createSessionStorageNamespace() OVERRIDE;
     virtual bool canAccessStorage(LocalFrame*, StorageType) const OVERRIDE { return false; }
 };
 
 void fillWithEmptyClients(Page::PageClients&);
 
 }
 
 #endif // EmptyClients_h