Clean up forward declarations in Source/core/page

Source/core/page/ChromeClient.h

 /*
  * Copyright (C) 2006, 2007, 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.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 46 matching lines @@
 class HTMLFormControlElement;
 class HTMLInputElement;
 class IntRect;
 class LocalFrame;
 class Node;
 class Page;
 class PagePopup;
 class PagePopupClient;
 class PagePopupDriver;
 class PopupMenuClient;
-class SecurityOrigin;
-class Widget;
 
 struct DateTimeChooserParameters;
 struct FrameLoadRequest;
 struct GraphicsDeviceAdapter;
 struct ViewportDescription;
 struct WindowFeatures;
 
 class ChromeClient {
 public:
     virtual void chromeDestroyed() = 0;
@@ skipping 154 matching lines @@
     virtual void willSetInputMethodState() { }
     virtual void didUpdateTextOfFocusedElementByNonUserInput() { }
     virtual void showImeIfNeeded() { }
 
 protected:
     virtual ~ChromeClient() { }
 };
 
 }
 #endif // ChromeClient_h