Clean forward declaration in public

public/web/WebDevToolsFrontendClient.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 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebDevToolsFrontendClient_h
 #define WebDevToolsFrontendClient_h
 
 namespace blink {
 
 class WebString;
-struct WebFloatPoint;
-struct WebDevToolsMessageData;
 
 class WebDevToolsFrontendClient {
 public:
     WebDevToolsFrontendClient() { }
 
     virtual void sendMessageToBackend(const WebString&) { }
 
     virtual void sendMessageToEmbedder(const WebString&) { }
 
     virtual bool isUnderTest() { return false; }
 
 protected:
     virtual ~WebDevToolsFrontendClient() {}
 };
 
 } // namespace blink
 
 #endif