Clean forward declaration in public

public/web/WebFrame.h

 /*
  * Copyright (C) 2009 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 45 matching lines @@
 
 namespace blink {
 
 class Frame;
 class OpenedFrameTracker;
 class Visitor;
 class WebData;
 class WebDataSource;
 class WebDocument;
 class WebElement;
-class WebFormElement;
-class WebFrameClient;
-class WebInputElement;
 class WebLayer;
 class WebLocalFrame;
 class WebPerformance;
 class WebPermissionClient;
 class WebRange;
 class WebRemoteFrame;
 class WebSecurityOrigin;
 class WebSharedWorkerRepositoryClient;
 class WebString;
 class WebURL;
@@ skipping 616 matching lines @@
     WebPrivateOwnPtr<OpenedFrameTracker> m_openedFrameTracker;
 };
 
 #if BLINK_IMPLEMENTATION
 Frame* toCoreFrame(const WebFrame*);
 #endif
 
 } // namespace blink
 
 #endif