Remove media::AudioRendererImpl::SignalEndOfStream() and some other minor cleanup.

media/filters/audio_renderer_impl.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.
 
 // Audio rendering unit utilizing an AudioRendererSink to output data.
 //
 // This class lives inside three threads during it's lifetime, namely:
 // 1. Render thread.
 //    This object is created on the render thread.
 // 2. Pipeline thread
@@ skipping 67 matching lines @@
   // enough.  In such scenarios, the callee should zero out unused portions
   // of their buffer to playback silence.
   //
   // FillBuffer() updates the pipeline's playback timestamp. If FillBuffer() is
   // not called at the same rate as audio samples are played, then the reported
   // timestamp in the pipeline will be ahead of the actual audio playback. In
   // this case |playback_delay| should be used to indicate when in the future
   // should the filled buffer be played. If FillBuffer() is called as the audio
   // hardware plays the buffer, then |playback_delay| should be zero.
   //
-  // FillBuffer() calls SignalEndOfStream() when it reaches end of stream.
-  //
   // Safe to call on any thread.
   uint32 FillBuffer(uint8* dest,
                     uint32 requested_frames,
                     const base::TimeDelta& playback_delay);
 
-  // Called at the end of stream when all the hardware buffers become empty
-  // (i.e. when all the data written to the device has been played).
-  void SignalEndOfStream();
-
   // Get the playback rate of |algorithm_|.
   float GetPlaybackRate();
 
   // Convert number of bytes to duration of time using information about the
   // number of channels, sample rate and sample bits.
   base::TimeDelta ConvertToDuration(int bytes);
 
   // Estimate earliest time when current buffer can stop playing.
   void UpdateEarliestEndTime(int bytes_filled,
                              base::TimeDelta request_delay,
@@ skipping 96 matching lines @@
   AudioParameters audio_parameters_;
 
   AudioDecoder::ReadCB read_cb_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioRendererImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_AUDIO_RENDERER_IMPL_H_