Eliminate ash::internal namespace

ash/test/shelf_test_api.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_TEST_SHELF_TEST_API_H_
 #define ASH_TEST_SHELF_TEST_API_H_
 
 #include "base/basictypes.h"
 
 namespace ash {
 
 class Shelf;
 class ShelfDelegate;
-
-namespace internal {
 class ShelfView;
-}
 
 namespace test {
 
 // Use the api in this class to access private members of Shelf.
 class ShelfTestAPI {
  public:
   explicit ShelfTestAPI(Shelf* shelf);
 
   ~ShelfTestAPI();
 
   // An accessor for |shelf_view|.
-  internal::ShelfView* shelf_view();
+  ShelfView* shelf_view();
 
   // Set ShelfDelegate.
   void SetShelfDelegate(ShelfDelegate* delegate);
 
  private:
   Shelf* shelf_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfTestAPI);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_SHELF_TEST_API_H_