Add missing IWYU message_loop.h includes.

remoting/base/auto_thread_unittest.cc

Index: remoting/base/auto_thread_unittest.cc
diff --git a/remoting/base/auto_thread_unittest.cc b/remoting/base/auto_thread_unittest.cc
index 5c72e3513a22ee1a8e89b5db223a026f9d729e13..a825753a1daf617f5b8d3ded54fc47c1bc99576a 100644
--- a/remoting/base/auto_thread_unittest.cc
+++ b/remoting/base/auto_thread_unittest.cc
@@ -2,14 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "remoting/base/auto_thread.h"

[Do not use (sergeyu), 2017/05/16 00:20:46]

includes order is wrong here

[gab, 2017/05/16 14:12:50]

No it's not, this is git cl format's output.

The matching foo.h header for foo.cc and foo_unittest.cc goes at the top.

In general there should also be a newline but this isn't against style and is
the current output of git cl format (and one-off fixing includes in mass
refactorings isn't going to happen: http://crbug.com/710164 is up for clang team
to address this prefered chromium style).

 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
+#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/scoped_native_library.h"
 #include "base/single_thread_task_runner.h"
 #include "build/build_config.h"
-#include "remoting/base/auto_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #if defined(OS_WIN)