Eliminate ash::internal namespace

ash/system/tray/hover_highlight_view.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 ASH_SYSTEM_TRAY_HOVER_HIGHLIGHT_VIEW_H_
 #define ASH_SYSTEM_TRAY_HOVER_HIGHLIGHT_VIEW_H_
 
 #include "ash/system/tray/actionable_view.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/gfx/font.h"
 
 namespace views {
 class Label;
 }
 
 namespace ash {
-namespace internal {
-
 class ViewClickListener;
 
 // A view that changes background color on hover, and triggers a callback in the
 // associated ViewClickListener on click. The view can also be forced to
 // maintain a fixed height.
 class HoverHighlightView : public ActionableView {
  public:
   explicit HoverHighlightView(ViewClickListener* listener);
   virtual ~HoverHighlightView();
 
@@ skipping 50 matching lines @@
   SkColor text_highlight_color_;
   SkColor text_default_color_;
   bool hover_;
   bool expandable_;
   bool checkable_;
   bool checked_;
 
   DISALLOW_COPY_AND_ASSIGN(HoverHighlightView);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_HOVER_HIGHLIGHT_VIEW_H_