Revert 245226 "Nukes MessageLoop::Dispatcher"

trunk/src/ash/accelerators/accelerator_dispatcher.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 "ash/accelerators/accelerator_dispatcher.h"
 
 #if defined(USE_X11)
 #include <X11/Xlib.h>
 
 // Xlib defines RootWindow
@@ skipping 49 matching lines @@
         (key_code == ui::VKEY_TAB)) {
       return true;
     }
   }
   return false;
 }
 
 }  // namespace
 
 AcceleratorDispatcher::AcceleratorDispatcher(
-    base::MessagePumpDispatcher* nested_dispatcher,
+    base::MessageLoop::Dispatcher* nested_dispatcher,
     aura::Window* associated_window)
     : nested_dispatcher_(nested_dispatcher),
       associated_window_(associated_window) {
   DCHECK(nested_dispatcher_);
   associated_window_->AddObserver(this);
 }
 
 AcceleratorDispatcher::~AcceleratorDispatcher() {
   if (associated_window_)
     associated_window_->RemoveObserver(this);
@@ skipping 49 matching lines @@
         return true;
     }
 
     return nested_dispatcher_->Dispatch(key_event.native_event());
   }
 
   return nested_dispatcher_->Dispatch(event);
 }
 
 }  // namespace ash