Eliminate ash::internal namespace

ash/wm/dock/docked_window_layout_manager_observer.h

 // Copyright 2013 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 UI_DOCK_DOCKED_WINDOW_LAYOUT_MANAGER_OBSERVER_H_
 #define UI_DOCK_DOCKED_WINDOW_LAYOUT_MANAGER_OBSERVER_H_
 
 #include "ash/ash_export.h"
 
 namespace gfx {
 class Rect;
 }
 
 namespace ash {
-namespace internal {
 
 // Observers to the DockedWindowLayoutManager are notified of significant
 // events that occur with the docked windows, such as the bounds change.
 class ASH_EXPORT DockedWindowLayoutManagerObserver {
  public:
   // Reason for notification. Allows selectively ignoring notifications to
   // prevent a notification loop.
   enum Reason {
     CHILD_CHANGED,
     DISPLAY_RESIZED,
     DISPLAY_INSETS_CHANGED,
     SHELF_ALIGNMENT_CHANGED,
     KEYBOARD_BOUNDS_CHANGING
   };
   // Called after the dock bounds are changed.
   virtual void OnDockBoundsChanging(const gfx::Rect& new_bounds,
                                     Reason reason) = 0;
 
  protected:
   virtual ~DockedWindowLayoutManagerObserver() {}
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // UI_DOCK_DOCKED_WINDOW_LAYOUT_MANAGER_OBSERVER_H_