Revert of Forward the number of skipped frames by the OS in audio playout.

content/browser/renderer_host/media/audio_sync_reader.cc

Index: content/browser/renderer_host/media/audio_sync_reader.cc
diff --git a/content/browser/renderer_host/media/audio_sync_reader.cc b/content/browser/renderer_host/media/audio_sync_reader.cc
index ea794a213c070a3666843f35272f0a87a930b528..f6b3d6cef3f7db4a593402a2b355381fc8180f6a 100644
--- a/content/browser/renderer_host/media/audio_sync_reader.cc
+++ b/content/browser/renderer_host/media/audio_sync_reader.cc
@@ -15,7 +15,6 @@
 #include "media/audio/audio_parameters.h"
 
 using media::AudioBus;
-using media::AudioOutputBuffer;
 
 namespace {
 
@@ -52,12 +51,8 @@
       maximum_wait_time_(base::TimeDelta::FromMilliseconds(20)),
 #endif
       buffer_index_(0) {
-  DCHECK_EQ(static_cast<size_t>(packet_size_),
-            sizeof(media::AudioOutputBufferParameters) +
-                AudioBus::CalculateMemorySize(params));
-  AudioOutputBuffer* buffer =
-      reinterpret_cast<AudioOutputBuffer*>(shared_memory_->memory());
-  output_bus_ = AudioBus::WrapMemory(params, buffer->audio);
+  DCHECK_EQ(packet_size_, AudioBus::CalculateMemorySize(params));
+  output_bus_ = AudioBus::WrapMemory(params, shared_memory->memory());
   output_bus_->Zero();
 }
 
@@ -86,19 +81,10 @@
 }
 
 // media::AudioOutputController::SyncReader implementations.
-void AudioSyncReader::UpdatePendingBytes(uint32_t bytes,
-                                         uint32_t frames_skipped) {
-  // Increase the number of skipped frames stored in shared memory. We don't
-  // send it over the socket since sending more than 4 bytes might lead to being
-  // descheduled. The reading side will zero it when consumed.
-  AudioOutputBuffer* buffer =
-      reinterpret_cast<AudioOutputBuffer*>(shared_memory_->memory());
-  buffer->params.frames_skipped += frames_skipped;
-
+void AudioSyncReader::UpdatePendingBytes(uint32 bytes) {
   // Zero out the entire output buffer to avoid stuttering/repeating-buffers
   // in the anomalous case if the renderer is unable to keep up with real-time.
   output_bus_->Zero();
-
   socket_->Send(&bytes, sizeof(bytes));
   ++buffer_index_;
 }