Eliminate ash::internal namespace

ash/test/ash_test_base.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_TEST_ASH_TEST_BASE_H_
 #define ASH_TEST_ASH_TEST_BASE_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 13 matching lines @@
 class RootWindow;
 class Window;
 class WindowDelegate;
 
 namespace test {
 class EventGenerator;
 }  // namespace test
 }  // namespace aura
 
 namespace ash {
-namespace internal {
 class DisplayManager;
-}  // namespace internal
 
 namespace test {
 
 class AshTestHelper;
 class TestScreenshotDelegate;
 class TestSystemTrayDelegate;
 #if defined(OS_WIN)
 class TestMetroViewerProcessHost;
 #endif
 
@@ skipping 114 matching lines @@
   virtual ~NoSessionAshTestBase() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NoSessionAshTestBase);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_ASH_TEST_BASE_H_