Simplify AudioInputRendererHost IPC interface.

media/audio/audio_input_device.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.
 
 // Low-latency audio capturing class utilizing audio input stream provided
 // by a server (browser) process by use of an IPC interface.
 //
 // Relationship of classes:
 //
 //  AudioInputController                 AudioInputDevice
@@ skipping 85 matching lines @@
  protected:
   friend class base::RefCountedThreadSafe<AudioInputDevice>;
   ~AudioInputDevice() override;
 
   // Methods called on IO thread ----------------------------------------------
   // AudioInputIPCDelegate implementation.
   void OnStreamCreated(base::SharedMemoryHandle handle,
                        base::SyncSocket::Handle socket_handle,
                        int length,
                        int total_segments) override;
-  void OnVolume(double volume) override;
-  void OnStateChanged(AudioInputIPCDelegateState state) override;
+  void OnError() override;
   void OnIPCClosed() override;
 
  private:
   // Note: The ordering of members in this enum is critical to correct behavior!
   enum State {
     IPC_CLOSED,  // No more IPCs can take place.
     IDLE,  // Not started.
     CREATING_STREAM,  // Waiting for OnStreamCreated() to be called back.
     RECORDING,  // Receiving audio data.
   };
@@ skipping 48 matching lines @@
   // TODO(miu): Replace this by changing AudioCapturerSource to accept the
   // callback via Start(). See http://crbug.com/151051 for details.
   bool stopping_hack_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(AudioInputDevice);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_INPUT_DEVICE_H_