Clean forward declaration in public

public/web/WebSpeechRecognizer.h

 /*
  * Copyright (C) 2012 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 copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 13 matching lines @@
  */
 
 #ifndef WebSpeechRecognizer_h
 #define WebSpeechRecognizer_h
 
 #include "../platform/WebCommon.h"
 #include "WebSpeechRecognitionHandle.h"
 
 namespace blink {
 
-class WebSpeechGrammar;
 class WebSpeechRecognitionParams;
 class WebSpeechRecognizerClient;
 
 // Interface for speech recognition, to be implemented by the embedder.
 class WebSpeechRecognizer {
 public:
     // Start speech recognition for the specified handle using the specified parameters. Notifications on progress, results, and errors will be sent via the client.
     virtual void start(const WebSpeechRecognitionHandle&, const WebSpeechRecognitionParams&, WebSpeechRecognizerClient*) { BLINK_ASSERT_NOT_REACHED(); }
 
     // Stop speech recognition for the specified handle, returning any results for the audio recorded so far. Notifications and errors are sent via the client.
     virtual void stop(const WebSpeechRecognitionHandle&, WebSpeechRecognizerClient*) { BLINK_ASSERT_NOT_REACHED(); }
 
     // Abort speech recognition for the specified handle, discarding any recorded audio. Notifications and errors are sent via the client.
     virtual void abort(const WebSpeechRecognitionHandle&, WebSpeechRecognizerClient*) { BLINK_ASSERT_NOT_REACHED(); }
 
 protected:
     virtual ~WebSpeechRecognizer() { }
 };
 
 } // namespace blink
 
 #endif // WebSpeechRecognizer_h