Use MessageLoopProxy for network message loop.

remoting/host/screen_recorder.h

Index: remoting/host/screen_recorder.h
diff --git a/remoting/host/screen_recorder.h b/remoting/host/screen_recorder.h
index 3007aa52917e6f62e8b53e33f82bbea2536a7039..3398548a37ee0b3bb6f25ea90984cf86a4457b7a 100644
--- a/remoting/host/screen_recorder.h
+++ b/remoting/host/screen_recorder.h
@@ -17,6 +17,10 @@
 #include "remoting/host/capturer.h"
 #include "remoting/proto/video.pb.h"
 
+namespace base {
+class MessageLoopProxy;
+}  // namespace base
+
 namespace remoting {
 
 namespace protocol {
@@ -74,7 +78,7 @@ class ScreenRecorder : public base::RefCountedThreadSafe<ScreenRecorder> {
   // This object does not own capturer but owns encoder.
   ScreenRecorder(MessageLoop* capture_loop,
                  MessageLoop* encode_loop,
-                 MessageLoop* network_loop,
+                 base::MessageLoopProxy* network_loop,
                  Capturer* capturer,
                  Encoder* encoder);
 
@@ -160,7 +164,7 @@ class ScreenRecorder : public base::RefCountedThreadSafe<ScreenRecorder> {
   // Message loops used by this class.
   MessageLoop* capture_loop_;
   MessageLoop* encode_loop_;
-  MessageLoop* network_loop_;
+  scoped_refptr<base::MessageLoopProxy> network_loop_;
 
   // Reference to the capturer. This member is always accessed on the capture
   // thread.