Eliminate ash::internal namespace

ash/shelf/background_animator.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_SHELF_BACKGROUND_ANIMATOR_H_
 #define ASH_SHELF_BACKGROUND_ANIMATOR_H_
 
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
 #include "ui/gfx/animation/animation_delegate.h"
 #include "ui/gfx/animation/slide_animation.h"
 
 namespace ash {
 
 // How the background can be changed.
 enum BackgroundAnimatorChangeType {
   BACKGROUND_CHANGE_ANIMATE,
   BACKGROUND_CHANGE_IMMEDIATE
 };
 
-namespace internal {
-
 // Delegate is notified any time the background changes.
 class ASH_EXPORT BackgroundAnimatorDelegate {
  public:
   virtual void UpdateBackground(int alpha) = 0;
 
  protected:
   virtual ~BackgroundAnimatorDelegate() {}
 };
 
 // BackgroundAnimator is used by the shelf to animate the background (alpha).
@@ skipping 29 matching lines @@
 
   // Whether the background is painted.
   bool paints_background_;
 
   // Current alpha value of the background.
   int alpha_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundAnimator);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SHELF_BACKGROUND_ANIMATOR_H_