Remove calls to MessageLoop::current() in remoting.

remoting/host/setup/start_host_main.cc

Index: remoting/host/setup/start_host_main.cc
diff --git a/remoting/host/setup/start_host_main.cc b/remoting/host/setup/start_host_main.cc
index b6213f770ed6a0dd8f690d42ab7e7ad1ee18d77c..9a87abb3f6efcf84f3769f65b5af5f5494d4b580 100644
--- a/remoting/host/setup/start_host_main.cc
+++ b/remoting/host/setup/start_host_main.cc
@@ -10,6 +10,7 @@
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/thread.h"
 #include "build/build_config.h"
@@ -86,7 +87,7 @@ std::string ReadString(bool no_echo) {
 
 // Called when the HostStarter has finished.
 void OnDone(HostStarter::Result result) {
-  if (base::MessageLoop::current() != g_message_loop) {
+  if (!g_message_loop->task_runner()->BelongsToCurrentThread()) {
     g_message_loop->PostTask(FROM_HERE, base::Bind(&OnDone, result));
     return;
   }
@@ -238,4 +239,4 @@ int StartHostMain(int argc, char** argv) {
   return g_started ? 0 : 1;
 }
 
-}  // namespace remoting
+}  // namespace remoting