Revert 206507 "Move message_pump to base/message_loop."

trunk/src/base/message_loop/message_pump_dispatcher.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.
-
-#ifndef BASE_MESSAGE_LOOP_MESSAGE_PUMP_DISPATCHER_H
-#define BASE_MESSAGE_LOOP_MESSAGE_PUMP_DISPATCHER_H
-
-#include "base/base_export.h"
-#include "base/event_types.h"
-
-namespace base {
-
-// Dispatcher is used during a nested invocation of Run to dispatch events when
-// |RunLoop(dispatcher).Run()| is used.  If |RunLoop().Run()| is invoked,
-// MessageLoop does not dispatch events (or invoke TranslateMessage), rather
-// every message is passed to Dispatcher's Dispatch method for dispatch. It is
-// up to the Dispatcher whether or not to dispatch the event.
-//
-// The nested loop is exited by either posting a quit, or returning false
-// from Dispatch.
-class BASE_EXPORT MessagePumpDispatcher {
- public:
-  virtual ~MessagePumpDispatcher() {}
-
-  // Dispatches the event. If true is returned processing continues as
-  // normal. If false is returned, the nested loop exits immediately.
-  virtual bool Dispatch(const NativeEvent& event) = 0;
-};
-
-}  // namespace base
-
-#endif  // BASE_MESSAGE_LOOP_MESSAGE_PUMP_DISPATCHER_H