Use MessageLoopProxy for network message loop.

remoting/protocol/host_control_sender.cc

Index: remoting/protocol/host_control_sender.cc
diff --git a/remoting/protocol/host_control_sender.cc b/remoting/protocol/host_control_sender.cc
index 6acc940784402ad14c8c1b4c6bb2a39f81f55016..6e71341a05b956b3beac60a0177718c75d882175 100644
--- a/remoting/protocol/host_control_sender.cc
+++ b/remoting/protocol/host_control_sender.cc
@@ -16,8 +16,9 @@
 namespace remoting {
 namespace protocol {
 
-HostControlSender::HostControlSender(net::Socket* socket)
-    : buffered_writer_(new BufferedSocketWriter()) {
+HostControlSender::HostControlSender(base::MessageLoopProxy* message_loop,
+                                     net::Socket* socket)
+    : buffered_writer_(new BufferedSocketWriter(message_loop)) {
   buffered_writer_->Init(socket, NULL);
 }