Clean up forward declarations in Source/web

Source/web/WebDevToolsAgentImpl.h

 /*
  * Copyright (C) 2010 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 26 matching lines @@
 #include "public/platform/WebSize.h"
 #include "public/platform/WebThread.h"
 #include "public/web/WebPageOverlay.h"
 #include "web/WebDevToolsAgentPrivate.h"
 #include "wtf/Forward.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
-class Document;
 class LocalFrame;
-class FrameView;
-class GraphicsContext;
 class InspectorClient;
 class InspectorController;
-class Node;
 class Page;
 class PlatformKeyboardEvent;
 class WebDevToolsAgentClient;
-class WebFrame;
 class WebLocalFrameImpl;
 class WebString;
-class WebURLRequest;
-class WebURLResponse;
 class WebViewImpl;
-struct WebMemoryUsageInfo;
-struct WebURLError;
-struct WebDevToolsMessageData;
 
 class WebDevToolsAgentImpl final
     : public WebDevToolsAgentPrivate
     , public InspectorClient
     , public InspectorFrontendChannel
     , public WebPageOverlay
     , private WebThread::TaskObserver {
 public:
     WebDevToolsAgentImpl(WebViewImpl* webViewImpl, WebDevToolsAgentClient* client);
     virtual ~WebDevToolsAgentImpl();
@@ skipping 82 matching lines @@
     OwnPtr<IntPoint> m_lastPinchAnchorCss;
     OwnPtr<IntPoint> m_lastPinchAnchorDip;
 
     typedef Vector<RefPtr<JSONObject> > FrontendMessageQueue;
     FrontendMessageQueue m_frontendMessageQueue;
 };
 
 } // namespace blink
 
 #endif