Add missing IWYU message_loop.h includes.

remoting/base/auto_thread_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // 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)
 #include <objbase.h>
 #include "base/win/windows_version.h"
 #endif
 
 namespace {
 
 const char kThreadName[] = "Test thread";
@@ skipping 173 matching lines @@
     // Whether the thread is the "main" STA apartment depends upon previous
     // COM activity in this test process, so allow both types here.
     EXPECT_TRUE(apt_type == APTTYPE_MAINSTA || apt_type == APTTYPE_STA);
   } else {
     EXPECT_EQ(E_NOTIMPL, hresult);
   }
 }
 #endif // defined(OS_WIN)
 
 }  // namespace remoting