Simplify AudioInputRendererHost IPC interface.

content/renderer/pepper/pepper_platform_audio_input.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.
 
 #ifndef CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_AUDIO_INPUT_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_AUDIO_INPUT_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 44 matching lines @@
   void StartCapture();
   void StopCapture();
   // Closes the stream. Make sure to call this before the object is destructed.
   void ShutDown();
 
   // media::AudioInputIPCDelegate.
   void OnStreamCreated(base::SharedMemoryHandle handle,
                        base::SyncSocket::Handle socket_handle,
                        int length,
                        int total_segments) override;
-  void OnVolume(double volume) override;
-  void OnStateChanged(media::AudioInputIPCDelegateState state) override;
+  void OnError() override;
   void OnIPCClosed() override;
 
  protected:
   ~PepperPlatformAudioInput() override;
 
  private:
   friend class base::RefCountedThreadSafe<PepperPlatformAudioInput>;
 
   PepperPlatformAudioInput();
 
@@ skipping 49 matching lines @@
   bool pending_open_device_;
   // THIS MUST ONLY BE ACCESSED ON THE MAIN THREAD.
   int pending_open_device_id_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperPlatformAudioInput);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_AUDIO_INPUT_H_