Eliminate ash::internal namespace

ash/wm/workspace/workspace_event_handler_test_helper.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_WM_WORKSPACE_WORKSPACE_EVENT_HANDLER_TEST_HELPER_H_
 #define ASH_WM_WORKSPACE_WORKSPACE_EVENT_HANDLER_TEST_HELPER_H_
 
 #include "ash/wm/workspace/workspace_event_handler.h"
 
 namespace ash {
-namespace internal {
 
 class WorkspaceEventHandlerTestHelper {
  public:
   explicit WorkspaceEventHandlerTestHelper(WorkspaceEventHandler* handler);
   ~WorkspaceEventHandlerTestHelper();
 
   MultiWindowResizeController* resize_controller() {
     return &(handler_->multi_window_resize_controller_);
   }
 
  private:
   WorkspaceEventHandler* handler_;
 
   DISALLOW_COPY_AND_ASSIGN(WorkspaceEventHandlerTestHelper);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_WORKSPACE_EVENT_HANDLER_TEST_HELPER_H_