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

sync/js/sync_js_controller_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 "sync/js/sync_js_controller.h"
 
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/values.h"
 #include "sync/js/js_arg_list.h"
 #include "sync/js/js_event_details.h"
 #include "sync/js/js_test_util.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace syncer {
 namespace {
 
@@ skipping 99 matching lines @@
   sync_js_controller.HandleJsEvent("anotherevent", details2);
   sync_js_controller.RemoveJsEventHandler(&event_handler1);
   sync_js_controller.RemoveJsEventHandler(&event_handler2);
   sync_js_controller.HandleJsEvent("droppedevent", details2);
 
   PumpLoop();
 }
 
 }  // namespace
 }  // namespace syncer