Simplify AudioInputRendererHost IPC interface.

content/browser/renderer_host/media/audio_input_renderer_host.h

 // Copyright (c) 2012 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.
 //
 // AudioInputRendererHost serves audio related requests from audio capturer
 // which lives inside the render process and provide access to audio hardware.
 //
 // Create stream sequence (AudioInputController = AIC):
 //
 // AudioInputHostMsg_CreateStream -> OnCreateStream -> AIC::CreateLowLatency ->
@@ skipping 88 matching lines @@
   void DisableDebugRecording();
 #endif
 
   // BrowserMessageFilter implementation.
   void OnChannelClosing() override;
   void OnDestruct() const override;
   bool OnMessageReceived(const IPC::Message& message) override;
 
   // AudioInputController::EventHandler implementation.
   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;
 
   // Sets the PID renderer. This is used for constructing the debug recording
   // filename.
   void set_renderer_pid(int32_t renderer_pid);
@@ skipping 122 matching lines @@
   media::UserInputMonitor* user_input_monitor_;
 
   std::unique_ptr<media::AudioLog> audio_log_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioInputRendererHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_RENDERER_HOST_H_