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

sync/notifier/sync_system_resources_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/notifier/sync_system_resources.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 
 #include "google/cacheinvalidation/include/types.h"
 #include "jingle/notifier/listener/fake_push_client.h"
 #include "sync/notifier/state_writer.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace syncer {
 namespace {
 
@@ skipping 146 matching lines @@
       .WillOnce(SaveArg<0>(&results));
   sync_system_resources_.storage()->WriteKey(
       std::string(), "state", mock_storage_callback.CreateCallback());
   message_loop_.RunUntilIdle();
   EXPECT_EQ(invalidation::Status(invalidation::Status::SUCCESS, std::string()),
             results);
 }
 
 }  // namespace
 }  // namespace syncer