Eliminate ash::internal namespace

ash/wm/workspace/workspace_event_handler.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_H_
 #define ASH_WM_WORKSPACE_WORKSPACE_EVENT_HANDLER_H_
 
 #include "ash/wm/workspace/multi_window_resize_controller.h"
 #include "ui/events/event_handler.h"
 
 namespace ash {
+class WorkspaceEventHandlerTestHelper;
+
 namespace wm {
 class WindowState;
 }
 
-namespace internal {
-
-class WorkspaceEventHandlerTestHelper;
-
 class WorkspaceEventHandler : public ui::EventHandler {
  public:
   WorkspaceEventHandler();
   virtual ~WorkspaceEventHandler();
 
   // ui::EventHandler:
   virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
 
  private:
   friend class WorkspaceEventHandlerTestHelper;
 
   // Determines if |event| corresponds to a double click on either the top or
   // bottom vertical resize edge, and if so toggles the vertical height of the
   // window between its restored state and the full available height of the
   // workspace.
   void HandleVerticalResizeDoubleClick(wm::WindowState* window_state,
                                        ui::MouseEvent* event);
 
   MultiWindowResizeController multi_window_resize_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(WorkspaceEventHandler);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_WORKSPACE_EVENT_HANDLER_H_