chrome: Cleanup class/struct forward declarations

chrome/browser/ui/app_list/speech_recognizer_delegate.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_APP_LIST_SPEECH_RECOGNIZER_DELEGATE_H_
 #define CHROME_BROWSER_UI_APP_LIST_SPEECH_RECOGNIZER_DELEGATE_H_
 
 #include <stdint.h>
 #include <string>
 
 #include "base/strings/string16.h"
 #include "ui/app_list/speech_ui_model_observer.h"
 
-namespace content {
-class WebContents;
-}
-
 namespace app_list {
 
 // Delegate for the app list speech recognizer. All methods are called from the
 // UI thread.
 class SpeechRecognizerDelegate {
  public:
   // Receive a speech recognition result. |is_final| indicated whether the
   // result is an intermediate or final result. If |is_final| is true, then the
   // recognizer stops and no more results will be returned.
   virtual void OnSpeechResult(const base::string16& query, bool is_final) = 0;
@@ skipping 10 matching lines @@
   virtual void GetSpeechAuthParameters(std::string* auth_scope,
                                        std::string* auth_token) = 0;
 
  protected:
   virtual ~SpeechRecognizerDelegate() {}
 };
 
 }  // namespace app_list
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_SPEECH_RECOGNIZER_DELEGATE_H_