Eliminate ash::internal namespace

ash/shelf/alternate_app_list_button.h

 // Copyright 2014 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_ALTERNATE_APP_LIST_BUTTON_H_
 #define ASH_SHELF_ALTERNATE_APP_LIST_BUTTON_H_
 
 #include "ui/views/controls/button/image_button.h"
 
 namespace ash {
-
+class ShelfButtonHost;
 class ShelfWidget;
 
-namespace internal {
-
-class ShelfButtonHost;
-
 // Button used for the AppList icon on the shelf.
-// This class is an alternate implementation to ash::internal::AppListButton
+// This class is an alternate implementation to ash::AppListButton
 // for the purposes of testing an alternate shelf layout
 // (see ash_switches: UseAlternateShelfLayout).
 class AlternateAppListButton : public views::ImageButton {
  public:
   // Bounds size (inset) required for the app icon image (in pixels).
   static const int kImageBoundsSize;
 
   AlternateAppListButton(views::ButtonListener* listener,
                          ShelfButtonHost* host,
                          ShelfWidget* shelf_widget);
@@ skipping 16 matching lines @@
 
  private:
   ShelfButtonHost* host_;
   // Reference to the shelf widget containing this button, owned by the
   // root window controller.
   ShelfWidget* shelf_widget_;
 
   DISALLOW_COPY_AND_ASSIGN(AlternateAppListButton);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SHELF_ALTERNATE_APP_LIST_BUTTON_H_