Remove unnecessary message_loop_proxy.h includes

base/memory/ref_counted_delete_on_message_loop.h

 // Copyright 2013 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.
 
 #ifndef BASE_MEMORY_REF_COUNTED_DELETE_ON_MESSAGE_LOOP_H_
 #define BASE_MEMORY_REF_COUNTED_DELETE_ON_MESSAGE_LOOP_H_
 
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
-// TODO(ricea): Remove the following include once all callers have been fixed.
-#include "base/message_loop/message_loop_proxy.h"
 #include "base/single_thread_task_runner.h"
 
 namespace base {
 
 // RefCountedDeleteOnMessageLoop is similar to RefCountedThreadSafe, and ensures
 // that the object will be deleted on a specified message loop.
 //
 // Sample usage:
 // class Foo : public RefCountedDeleteOnMessageLoop<Foo> {
 //
@@ skipping 46 matching lines @@
 
   scoped_refptr<SingleThreadTaskRunner> task_runner_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RefCountedDeleteOnMessageLoop);
 };
 
 }  // namespace base
 
 #endif  // BASE_MEMORY_REF_COUNTED_DELETE_ON_MESSAGE_LOOP_H_