Move VideoDecoder out of media pipeline.

content/renderer/media/rtc_video_decoder.cc

Index: content/renderer/media/rtc_video_decoder.cc
diff --git a/content/renderer/media/rtc_video_decoder.cc b/content/renderer/media/rtc_video_decoder.cc
index 1a51c1e085c253049046838eb911f46cbc9b0274..1ffb1fb753fcb13226c88c0a531119f6673d9d61 100644
--- a/content/renderer/media/rtc_video_decoder.cc
+++ b/content/renderer/media/rtc_video_decoder.cc
@@ -61,14 +61,13 @@ void RTCVideoDecoder::Initialize(DemuxerStream* demuxer_stream,
 void RTCVideoDecoder::Play(const base::Closure& callback) {
   if (MessageLoop::current() != message_loop_) {
     message_loop_->PostTask(FROM_HERE,
-                            base::Bind(&RTCVideoDecoder::Play,
-                                       this, callback));
+                            base::Bind(&RTCVideoDecoder::Play, this, callback));
     return;
   }
 
   DCHECK_EQ(MessageLoop::current(), message_loop_);
 
-  VideoDecoder::Play(callback);
+  callback.Run();
 }
 
 void RTCVideoDecoder::Pause(const base::Closure& callback) {
@@ -83,7 +82,7 @@ void RTCVideoDecoder::Pause(const base::Closure& callback) {
 
   state_ = kPaused;
 
-  VideoDecoder::Pause(callback);
+  callback.Run();
 }
 
 void RTCVideoDecoder::Flush(const base::Closure& callback) {