Eliminate the launcher speech recognizer's dependency on the start page WebContents.

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>
 
@@ skipping 15 matching lines @@
   // recognizer stops and no more results will be returned.
   virtual void OnSpeechResult(const base::string16& query, bool is_final) = 0;
 
   // Invoked regularly to indicate the average sound volume.
   virtual void OnSpeechSoundLevelChanged(int16_t level) = 0;
 
   // Invoked when the state of speech recognition is changed.
   virtual void OnSpeechRecognitionStateChanged(
       SpeechRecognitionState new_state) = 0;
 
-  // Return a WebContents that is whitelisted to use the speech recognizer.
-  // TODO(amistry): This is an implementation detail that shouldn't be
-  // necessary. Somehow, eliminate this dependency.
-  virtual content::WebContents* GetSpeechContents() = 0;
-
   // Get the OAuth2 scope and token to pass to the speech recognizer. Does not
   // modify the arguments if no auth token is available or allowed.
   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_