Use MessageLoopProxy for network message loop.

remoting/client/plugin/pepper_xmpp_proxy.cc

Index: remoting/client/plugin/pepper_xmpp_proxy.cc
diff --git a/remoting/client/plugin/pepper_xmpp_proxy.cc b/remoting/client/plugin/pepper_xmpp_proxy.cc
index cfdb842dd620270db0ff517d8b1519dcc06cc690..fb96bd13a3652556f27cbcdacc452fa6b0a1a6c7 100644
--- a/remoting/client/plugin/pepper_xmpp_proxy.cc
+++ b/remoting/client/plugin/pepper_xmpp_proxy.cc
@@ -2,17 +2,18 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "remoting/client/plugin/pepper_xmpp_proxy.h"
 
 #include "base/message_loop.h"
+#include "base/message_loop_proxy.h"
 #include "remoting/client/plugin/chromoting_scriptable_object.h"
 #include "remoting/client/plugin/pepper_util.h"
-#include "remoting/client/plugin/pepper_xmpp_proxy.h"
 
 namespace remoting {
 
 PepperXmppProxy::PepperXmppProxy(
     base::WeakPtr<ChromotingScriptableObject> scriptable_object,
-    MessageLoop* callback_message_loop)
+    base::MessageLoopProxy* callback_message_loop)
     : scriptable_object_(scriptable_object),
       callback_message_loop_(callback_message_loop) {
   CHECK(CurrentlyOnPluginThread());
@@ -22,7 +23,7 @@ PepperXmppProxy::~PepperXmppProxy() {
 }
 
 void PepperXmppProxy::AttachCallback(base::WeakPtr<ResponseCallback> callback) {
-  CHECK_EQ(callback_message_loop_, MessageLoop::current());
+  DCHECK(callback_message_loop_->BelongsToCurrentThread());
   callback_ = callback;
 }
 
@@ -44,7 +45,7 @@ void PepperXmppProxy::SendIq(const std::string& request_xml) {
 }
 
 void PepperXmppProxy::OnIq(const std::string& response_xml) {
-  if (MessageLoop::current() != callback_message_loop_) {
+  if (!callback_message_loop_->BelongsToCurrentThread()) {
     callback_message_loop_->PostTask(
         FROM_HERE,NewRunnableMethod(this,
                                     &PepperXmppProxy::OnIq,