Don't depend on MessageLoopProxy in remoting protocol code.

remoting/protocol/video_writer.cc

Index: remoting/protocol/video_writer.cc
diff --git a/remoting/protocol/video_writer.cc b/remoting/protocol/video_writer.cc
index b3e0f03c300c61d7879de9991fe53cc621e89e76..694765e0462d4e722a1fd9ec14e2fea6478b2cdf 100644
--- a/remoting/protocol/video_writer.cc
+++ b/remoting/protocol/video_writer.cc
@@ -13,11 +13,10 @@ namespace protocol {
 VideoWriter::~VideoWriter() { }
 
 // static
-VideoWriter* VideoWriter::Create(base::MessageLoopProxy* message_loop,
-                                 const SessionConfig& config) {
+VideoWriter* VideoWriter::Create(const SessionConfig& config) {
   const ChannelConfig& video_config = config.video_config();
   if (video_config.transport == ChannelConfig::TRANSPORT_STREAM) {
-    return new ProtobufVideoWriter(message_loop);
+    return new ProtobufVideoWriter();
   }
   return NULL;
 }