Use MessageLoopProxy for network message loop.

remoting/protocol/message_reader_unittest.cc

Index: remoting/protocol/message_reader_unittest.cc
diff --git a/remoting/protocol/message_reader_unittest.cc b/remoting/protocol/message_reader_unittest.cc
index 3237cb5fa93ba304aaa9d665b61ca8bf4756d273..84e2e31875a45037882c29e3e9479f26264c00f6 100644
--- a/remoting/protocol/message_reader_unittest.cc
+++ b/remoting/protocol/message_reader_unittest.cc
@@ -4,7 +4,6 @@
 
 #include <string>
 
-#include "base/message_loop.h"
 #include "net/socket/socket.h"
 #include "remoting/protocol/fake_session.h"
 #include "remoting/protocol/message_reader.h"
@@ -64,9 +63,6 @@ class MessageReaderTest : public testing::Test {
     delete task;
   }
 
-  // MessageLoop must be first here, so that is is destroyed the last.
-  MessageLoop message_loop_;
-
   scoped_refptr<MessageReader> reader_;
   FakeSocket socket_;
   MockMessageReceivedCallback callback_;