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

sync/engine/sync_scheduler_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 "base/bind.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/test/test_timeouts.h"
 #include "sync/engine/backoff_delay_provider.h"
 #include "sync/engine/sync_scheduler_impl.h"
 #include "sync/engine/syncer.h"
 #include "sync/internal_api/public/base/model_type_invalidation_map_test_util.h"
 #include "sync/sessions/test_util.h"
 #include "sync/test/callback_counter.h"
 #include "sync/test/engine/fake_model_worker.h"
 #include "sync/test/engine/mock_connection_manager.h"
 #include "sync/test/engine/test_directory_setter_upper.h"
@@ skipping 1284 matching lines @@
   // poll once more
   EXPECT_CALL(*syncer(), PollSyncShare(_,_))
       .WillOnce(DoAll(Invoke(sessions::test_util::SimulatePollSuccess),
                       WithArg<1>(RecordSyncShare(&records))));
   scheduler()->OnCredentialsUpdated();
   connection()->SetServerStatus(HttpResponse::SERVER_CONNECTION_OK);
   StopSyncScheduler();
 }
 
 }  // namespace syncer