Avoids irregular OnMoreData callbacks on Windows using Core Audio

media/audio/win/core_audio_util_win.cc

Index: media/audio/win/core_audio_util_win.cc
diff --git a/media/audio/win/core_audio_util_win.cc b/media/audio/win/core_audio_util_win.cc
index 2c262b4e72d37026199881a3fdaae3ef37601964..912085d2d9cea75d88299c172a67542d11be1424 100644
--- a/media/audio/win/core_audio_util_win.cc
+++ b/media/audio/win/core_audio_util_win.cc
@@ -549,34 +549,6 @@ ScopedComPtr<IAudioRenderClient> CoreAudioUtil::CreateRenderClient(
     DVLOG(1) << "IAudioClient::GetService: " << std::hex << hr;
     return ScopedComPtr<IAudioRenderClient>();
   }
-
-  // TODO(henrika): verify that this scheme is the same for shared mode and
-  // exclusive mode streams.
-
-  // Avoid start-up glitches by filling up the endpoint buffer with "silence"
-  // before starting the stream.
-  UINT32 endpoint_buffer_size = 0;
-  hr = client->GetBufferSize(&endpoint_buffer_size);
-  DVLOG_IF(1, FAILED(hr)) << "IAudioClient::GetBufferSize: " << std::hex << hr;
-
-  BYTE* data = NULL;
-  hr = audio_render_client->GetBuffer(endpoint_buffer_size, &data);
-  DVLOG_IF(1, FAILED(hr)) << "IAudioRenderClient::GetBuffer: "
-                          << std::hex << hr;
-  if (SUCCEEDED(hr)) {
-    // Using the AUDCLNT_BUFFERFLAGS_SILENT flag eliminates the need to
-    // explicitly write silence data to the rendering buffer.
-    hr = audio_render_client->ReleaseBuffer(endpoint_buffer_size,
-                                            AUDCLNT_BUFFERFLAGS_SILENT);
-    DVLOG_IF(1, FAILED(hr)) << "IAudioRenderClient::ReleaseBuffer: "
-                            << std::hex << hr;
-  }
-
-  // Sanity check: verify that the endpoint buffer is filled with silence.
-  UINT32 num_queued_frames = 0;
-  client->GetCurrentPadding(&num_queued_frames);
-  DCHECK(num_queued_frames == endpoint_buffer_size);
-
   return audio_render_client;
 }