Simplify AudioInputRendererHost IPC interface.

content/browser/speech/speech_recognizer_impl.h

 // Copyright (c) 2013 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 CONTENT_BROWSER_SPEECH_SPEECH_RECOGNIZER_IMPL_H_
 #define CONTENT_BROWSER_SPEECH_SPEECH_RECOGNIZER_IMPL_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 114 matching lines @@
   // OnAudioLevelsChange event accordingly.
   void UpdateSignalAndNoiseLevels(const float& rms, bool clip_detected);
 
   void CloseAudioControllerAsynchronously();
 
   // Callback called on IO thread by audio_controller->Close().
   void OnAudioClosed(media::AudioInputController*);
 
   // AudioInputController::EventHandler methods.
   void OnCreated(media::AudioInputController* controller) override {}
-  void OnRecording(media::AudioInputController* controller) override {}
   void OnError(media::AudioInputController* controller,
                media::AudioInputController::ErrorCode error_code) override;
   void OnData(media::AudioInputController* controller,
               const media::AudioBus* data) override;
   void OnLog(media::AudioInputController* controller,
              const std::string& message) override {}
 
   // SpeechRecognitionEngineDelegate methods.
   void OnSpeechRecognitionEngineResults(
       const SpeechRecognitionResults& results) override;
@@ skipping 20 matching lines @@
   // Converts data between native input format and a WebSpeech specific
   // output format.
   std::unique_ptr<SpeechRecognizerImpl::OnDataConverter> audio_converter_;
 
   DISALLOW_COPY_AND_ASSIGN(SpeechRecognizerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SPEECH_SPEECH_RECOGNIZER_IMPL_H_