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

sync/test/engine/fake_sync_scheduler.h

 // 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.
 //
 // A fake implementation of the SyncScheduler. If needed, we should add default
 // logic needed for tests (invoking callbacks, etc) here rather than in higher
 // level test classes.
 
 #ifndef SYNC_TEST_ENGINE_FAKE_SYNC_SCHEDULER_H_
 #define SYNC_TEST_ENGINE_FAKE_SYNC_SCHEDULER_H_
 
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "sync/engine/sync_scheduler.h"
 
 namespace syncer {
 
 class FakeSyncScheduler : public SyncScheduler {
  public:
   FakeSyncScheduler();
   virtual ~FakeSyncScheduler();
 
   virtual void Start(Mode mode) OVERRIDE;
@@ skipping 36 matching lines @@
   virtual void OnSyncProtocolError(
       const sessions::SyncSessionSnapshot& snapshot) OVERRIDE;
 
  private:
   base::MessageLoop* const created_on_loop_;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_TEST_ENGINE_FAKE_SYNC_SCHEDULER_H_