Revert of Allow muting/unmuting audio through media track API

media/base/pipeline_impl.cc

Index: media/base/pipeline_impl.cc
diff --git a/media/base/pipeline_impl.cc b/media/base/pipeline_impl.cc
index 7971a2ae5af2be205a2351bd772214eed30a8927..5f4705b5d2639c6b4b2dd65bceacc72178d26d9c 100644
--- a/media/base/pipeline_impl.cc
+++ b/media/base/pipeline_impl.cc
@@ -204,36 +204,6 @@ void PipelineImpl::SetCdm(CdmContext* cdm_context,
                             cdm_attached_cb));
 }
 
-void PipelineImpl::OnEnabledAudioStreamsChanged(
-    const std::vector<const DemuxerStream*>& enabledAudioStreams) {
-  if (!task_runner_->BelongsToCurrentThread()) {
-    task_runner_->PostTask(
-        FROM_HERE, base::Bind(&PipelineImpl::OnEnabledAudioStreamsChanged,
-                              weak_factory_.GetWeakPtr(), enabledAudioStreams));
-    return;
-  }
-  base::AutoLock auto_lock(lock_);
-  DCHECK(task_runner_->BelongsToCurrentThread());
-  if (renderer_) {
-    renderer_->OnEnabledAudioStreamsChanged(enabledAudioStreams);
-  }
-}
-
-void PipelineImpl::OnSelectedVideoStreamChanged(
-    const DemuxerStream* selectedVideoStream) {
-  if (!task_runner_->BelongsToCurrentThread()) {
-    task_runner_->PostTask(
-        FROM_HERE, base::Bind(&PipelineImpl::OnSelectedVideoStreamChanged,
-                              weak_factory_.GetWeakPtr(), selectedVideoStream));
-    return;
-  }
-  base::AutoLock auto_lock(lock_);
-  DCHECK(task_runner_->BelongsToCurrentThread());
-  if (renderer_) {
-    renderer_->OnSelectedVideoStreamChanged(selectedVideoStream);
-  }
-}
-
 void PipelineImpl::SetErrorForTesting(PipelineStatus status) {
   OnError(status);
 }