Eliminate ash::internal namespace

ash/wm/drag_window_controller.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_DRAG_WINDOW_CONTROLLER_H_
 #define ASH_WM_DRAG_WINDOW_CONTROLLER_H_
 
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/rect.h"
 
 namespace aura {
 class Window;
 }
 
 namespace ui {
 class Layer;
 class LayerTreeOwner;
 }
 
 namespace views {
 class Widget;
 }
 
 namespace ash {
-namespace internal {
 
 // DragWindowController is responsible for showing a semi-transparent window
 // while dragging a window across displays.
 class ASH_EXPORT DragWindowController {
  public:
   explicit DragWindowController(aura::Window* window);
   virtual ~DragWindowController();
 
   // Sets the display where the window is placed after the window is dropped.
   void SetDestinationDisplay(const gfx::Display& dst_display);
@@ skipping 44 matching lines @@
   gfx::Rect bounds_;
 
   views::Widget* drag_widget_;
 
   // The copy of window_->layer() and its descendants.
   scoped_ptr<ui::LayerTreeOwner> layer_owner_;
 
   DISALLOW_COPY_AND_ASSIGN(DragWindowController);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_DRAG_WINDOW_CONTROLLER_H_