Followup comments to r98147.

chrome/browser/speech/chrome_speech_input_manager.h

 // Copyright (c) 2011 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_SPEECH_CHROME_SPEECH_INPUT_MANAGER_H_
 #define CHROME_BROWSER_SPEECH_CHROME_SPEECH_INPUT_MANAGER_H_
 
 #include <map>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/singleton.h"
 #include "chrome/browser/speech/speech_input_bubble_controller.h"
 #include "content/browser/speech/speech_input_manager.h"
 #include "content/browser/speech/speech_recognizer.h"
 
 namespace speech_input {
 
+// This is Chrome's implementation of the SpeechInputManager interface. This
+// class is a singleton and accessed via the Get method.
 class ChromeSpeechInputManager : public SpeechInputManager,
                                  public SpeechInputBubbleControllerDelegate,
                                  public SpeechRecognizerDelegate {
  public:
   static ChromeSpeechInputManager* GetInstance();
 
   // SpeechInputManager methods.
   virtual void StartRecognition(SpeechInputManagerDelegate* delegate,
                                 int caller_id,
                                 int render_process_id,
@@ skipping 54 matching lines @@
   int recording_caller_id_;
   scoped_refptr<SpeechInputBubbleController> bubble_controller_;
   scoped_refptr<OptionalRequestInfo> optional_request_info_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeSpeechInputManager);
 };
 
 }  // namespace speech_input
 
 #endif  // CHROME_BROWSER_SPEECH_CHROME_SPEECH_INPUT_MANAGER_H_