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diff --git a/base/message_loop_helpers.h b/base/message_loop_helpers.h
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-// Copyright (c) 2011 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_MESSAGE_LOOP_HELPERS_H_
-#define BASE_MESSAGE_LOOP_HELPERS_H_
-#pragma once
-
-#include "base/basictypes.h"
-
-namespace tracked_objects {
-class Location;
-}
-
-namespace base {
-
-namespace subtle {
-template <class T, class R> class DeleteHelperInternal;
-}
-
-// This is a template helper which uses a function indirection to erase T from
-// the function signature while still remembering it so we can call the correct
-// destructor. We use this trick so we don't need to include bind.h in a
-// header file. We also embed the function in a class to make it easier for
-// users of DeleteSoon to declare the helper as a friend.
-template <class T>
-class DeleteHelper {
- private:
- // TODO(dcheng): Move the return type back to a function template parameter.
- template <class T2, class R> friend class subtle::DeleteHelperInternal;
-
- static void DoDelete(const void* object) {
- delete reinterpret_cast<const T*>(object);
- }
-
- DISALLOW_COPY_AND_ASSIGN(DeleteHelper);
-};
-
-namespace subtle {
-
-// An internal MessageLoop-like class helper for DeleteHelper. We don't want to
-// expose DoDelete directly since the void* argument makes it possible to pass
-// an object of the wrong type to delete. Instead, we force callers to go
-// through DeleteHelperInternal for type safety. MessageLoop-like classes which
-// expose a DeleteSoon method should friend this class and implement a
-// DeleteSoonInternal method with the following signature:
-// bool(const tracked_objects::Location&,
-// void(*deleter)(const void*),
-// void* object)
-// An implementation of DeleteSoonInternal should simply create a base::Closure
-// from (deleter, object) and return the result of posting the task.
-template <class T, class ReturnType>
-class DeleteHelperInternal {
- public:
- template <class MessageLoopType>
- static ReturnType DeleteOnMessageLoop(
- MessageLoopType* message_loop,
- const tracked_objects::Location& from_here,
- const T* object) {
- return message_loop->DeleteSoonInternal(from_here,
- &DeleteHelper<T>::DoDelete,
- object);
- }
-
- private:
- DISALLOW_COPY_AND_ASSIGN(DeleteHelperInternal);
-};
-
-} // namespace subtle
-
-} // namespace base
-
-#endif // BASE_MESSAGE_LOOP_HELPERS_H_