Use MessageLoopProxy for network message loop.

remoting/protocol/video_writer.h

Index: remoting/protocol/video_writer.h
diff --git a/remoting/protocol/video_writer.h b/remoting/protocol/video_writer.h
index 68b19fd4563fb9e8440610d5dfa8ba2645fd2288..2b5a7be6e4fcddb4090cb0914d131b174b2a21f5 100644
--- a/remoting/protocol/video_writer.h
+++ b/remoting/protocol/video_writer.h
@@ -14,6 +14,10 @@
 #include "base/callback.h"
 #include "remoting/protocol/video_stub.h"
 
+namespace base {
+class MessageLoopProxy;
+}  // namespace base
+
 namespace remoting {
 namespace protocol {
 
@@ -28,7 +32,8 @@ class VideoWriter : public VideoStub {
   // parameter is set to true on success.
   typedef base::Callback<void(bool)> InitializedCallback;
 
-  static VideoWriter* Create(const SessionConfig* config);
+  static VideoWriter* Create(base::MessageLoopProxy* message_loop,
+                             const SessionConfig* config);
 
   // Initializes the writer.
   virtual void Init(Session* session, const InitializedCallback& callback) = 0;