Use MessageLoopProxy for network message loop.

remoting/host/heartbeat_sender.cc

Index: remoting/host/heartbeat_sender.cc
diff --git a/remoting/host/heartbeat_sender.cc b/remoting/host/heartbeat_sender.cc
index f22486c8bac63e0c0af095bf45a5e3345c0c42fe..af739b0930e5be1acd21584d71d6f248db07cf7b 100644
--- a/remoting/host/heartbeat_sender.cc
+++ b/remoting/host/heartbeat_sender.cc
@@ -5,7 +5,7 @@
 #include "remoting/host/heartbeat_sender.h"
 
 #include "base/logging.h"
-#include "base/message_loop.h"
+#include "base/message_loop_proxy.h"
 #include "base/string_number_conversions.h"
 #include "base/time.h"
 #include "remoting/base/constants.h"
@@ -33,7 +33,7 @@ const char kSetIntervalTag[] = "set-interval";
 const int64 kDefaultHeartbeatIntervalMs = 5 * 60 * 1000;  // 5 minutes.
 }
 
-HeartbeatSender::HeartbeatSender(MessageLoop* message_loop,
+HeartbeatSender::HeartbeatSender(base::MessageLoopProxy* message_loop,
                                  MutableHostConfig* config)
 
     : state_(CREATED),
@@ -66,7 +66,7 @@ bool HeartbeatSender::Init() {
 
 void HeartbeatSender::OnSignallingConnected(SignalStrategy* signal_strategy,
                                             const std::string& full_jid) {
-  DCHECK_EQ(MessageLoop::current(), message_loop_);
+  DCHECK(message_loop_->BelongsToCurrentThread());
   DCHECK(state_ == INITIALIZED || state_ == STOPPED);
   state_ = STARTED;
 
@@ -80,7 +80,7 @@ void HeartbeatSender::OnSignallingConnected(SignalStrategy* signal_strategy,
 }
 
 void HeartbeatSender::OnSignallingDisconnected() {
-  DCHECK_EQ(MessageLoop::current(), message_loop_);
+  DCHECK(message_loop_->BelongsToCurrentThread());
   state_ = STOPPED;
   request_.reset(NULL);
 }
@@ -95,7 +95,7 @@ void HeartbeatSender::OnClientDisconnected(
 void HeartbeatSender::OnShutdown() { }
 
 void HeartbeatSender::DoSendStanza() {
-  DCHECK_EQ(MessageLoop::current(), message_loop_);
+  DCHECK(message_loop_->BelongsToCurrentThread());
   DCHECK_EQ(state_, STARTED);
 
   VLOG(1) << "Sending heartbeat stanza to " << kChromotingBotJid;
@@ -103,7 +103,7 @@ void HeartbeatSender::DoSendStanza() {
 }
 
 void HeartbeatSender::ProcessResponse(const XmlElement* response) {
-  DCHECK_EQ(MessageLoop::current(), message_loop_);
+  DCHECK(message_loop_->BelongsToCurrentThread());
 
   std::string type = response->Attr(buzz::QN_TYPE);
   if (type == buzz::STR_ERROR) {