Eliminate ash::internal namespace

ash/wm/event_client_impl.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 ASH_WM_EVENT_CLIENT_IMPL_H_
 #define ASH_WM_EVENT_CLIENT_IMPL_H_
 
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/aura/client/event_client.h"
 
 namespace ash {
-namespace internal {
 
 class EventClientImpl : public aura::client::EventClient {
  public:
   EventClientImpl();
   virtual ~EventClientImpl();
 
  private:
   // Overridden from aura::client::EventClient:
   virtual bool CanProcessEventsWithinSubtree(
       const aura::Window* window) const OVERRIDE;
   virtual ui::EventTarget* GetToplevelEventTarget() OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(EventClientImpl);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_EVENT_CLIENT_IMPL_H_