Use a direct include of the message_loop header in ppapi/, printing/, rlz/, sync/.

sync/util/get_session_name_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 <string>
 
 #include "base/bind.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "sync/util/get_session_name.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #if defined(OS_CHROMEOS)
 #include "base/command_line.h"
 #include "chromeos/chromeos_switches.h"
 #endif  // OS_CHROMEOS
 
 namespace syncer {
 
@@ skipping 61 matching lines @@
   GetSessionName(message_loop_.message_loop_proxy(),
                  base::Bind(&GetSessionNameTest::SetSessionNameAndQuit,
                             base::Unretained(this)));
   message_loop_.Run();
   EXPECT_EQ(session_name_, GetSessionNameSynchronouslyForTesting());
 }
 
 }  // namespace
 
 }  // namespace syncer