Replace MessageLoopProxy with SingleThreadTaskRunner for media/filters/ + associated code.

content/renderer/media/webmediaplayer_impl.cc

Index: content/renderer/media/webmediaplayer_impl.cc
diff --git a/content/renderer/media/webmediaplayer_impl.cc b/content/renderer/media/webmediaplayer_impl.cc
index 85561a487c52ca56d5552da064a6b22a915efd41..4c1a2ed6bf7fcbc9b7c7a77d4514828a5cc82f52 100644
--- a/content/renderer/media/webmediaplayer_impl.cc
+++ b/content/renderer/media/webmediaplayer_impl.cc
@@ -166,9 +166,9 @@ WebMediaPlayerImpl::WebMediaPlayerImpl(
   pipeline_.reset(new media::Pipeline(media_loop_, media_log_.get()));
 
   // |gpu_factories_| requires that its entry points be called on its
-  // |GetMessageLoop()|.  Since |pipeline_| will own decoders created from the
+  // |GetTaskRunner()|.  Since |pipeline_| will own decoders created from the
   // factories, require that their message loops are identical.
-  DCHECK(!gpu_factories_ || (gpu_factories_->GetMessageLoop() == media_loop_));
+  DCHECK(!gpu_factories_ || (gpu_factories_->GetTaskRunner() == media_loop_));
 
   // Let V8 know we started new thread if we did not do it yet.
   // Made separate task to avoid deletion of player currently being created.