Clean up forward declarations in WebKit/Source

Source/core/loader/FrameLoader.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) Research In Motion Limited 2009. All rights reserved.
  * Copyright (C) 2011 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:
  *
@@ skipping 34 matching lines @@
 #include "platform/Timer.h"
 #include "platform/heap/Handle.h"
 #include "platform/network/ResourceRequest.h"
 #include "wtf/Forward.h"
 #include "wtf/HashSet.h"
 #include "wtf/OwnPtr.h"
 
 namespace blink {
 
 class DocumentLoader;
-class Event;
 class FetchContext;
-class FormState;
 class Frame;
 class FrameLoaderClient;
-class NavigationAction;
 class ProgressTracker;
 class ResourceError;
 class SerializedScriptValue;
 class SubstituteData;
 
 struct FrameLoadRequest;
 
 bool isBackForwardLoadType(FrameLoadType);
 
 class FrameLoader final {
@@ skipping 207 matching lines @@
 
     bool m_didAccessInitialDocument;
     Timer<FrameLoader> m_didAccessInitialDocumentTimer;
 
     SandboxFlags m_forcedSandboxFlags;
 };
 
 } // namespace blink
 
 #endif // FrameLoader_h