Resubmit r56600 - Start/stop service process when browser starts and stop

remoting/host/chromoting_host.cc

Index: remoting/host/chromoting_host.cc
diff --git a/remoting/host/chromoting_host.cc b/remoting/host/chromoting_host.cc
index 3e47f543d5ea1e48574c7c4e38e142bf95f4eaa5..1bc7b984f2d362aacc076c16d7bc1b6fd0634042 100644
--- a/remoting/host/chromoting_host.cc
+++ b/remoting/host/chromoting_host.cc
@@ -255,6 +255,11 @@ void ChromotingHost::DoShutdown() {
     jingle_client_->Close();
   }
 
+  // Stop the heartbeat sender.
+  if (heartbeat_sender_) {
+    heartbeat_sender_->Stop();
+  }
+
   // Lastly call the shutdown task.
   if (shutdown_task_.get()) {
     shutdown_task_->Run();