chromeos: convert more ash/wm code to aura::Window

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/ash_export.h"
 #include "ash/wm/workspace/multi_window_resize_controller.h"
 #include "base/macros.h"
 
+namespace aura {
+class Window;
+}
+
 namespace ui {
 class GestureEvent;
 class MouseEvent;
 }
 
 namespace ash {
-class WmWindow;
 class WorkspaceEventHandlerTestHelper;
 
 namespace wm {
 class WindowState;
 }
 
 // ui::EventHandler like class installed on the window associated with
 // WorkspaceLayoutManager. This handles various events happening on child
 // windows and takes appropriate action. It is expected the environment specific
 // file calls OnMouseEvent()/OnGestureEvent() as appropriate.
 class ASH_EXPORT WorkspaceEventHandler {
  public:
   WorkspaceEventHandler();
   virtual ~WorkspaceEventHandler();
 
-  void OnMouseEvent(ui::MouseEvent* event, WmWindow* target);
-  void OnGestureEvent(ui::GestureEvent* event, WmWindow* target);
+  void OnMouseEvent(ui::MouseEvent* event, aura::Window* target);
+  void OnGestureEvent(ui::GestureEvent* event, aura::Window* target);
 
  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_;
 
   // The non-client component for the target of a MouseEvent or GestureEvent.
   // Events can be destructive to the window tree, which can cause the
   // component of a ui::EF_IS_DOUBLE_CLICK event to no longer be the same as
   // that of the initial click. Acting on a double click should only occur for
   // matching components. This will be set for left clicks, and tap events.
   int click_component_;
 
   DISALLOW_COPY_AND_ASSIGN(WorkspaceEventHandler);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_WORKSPACE_EVENT_HANDLER_H_