[mus+ash] Removes WmWindow from screen_dimmer and video_detector

ash/wm/workspace/workspace_layout_manager.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_LAYOUT_MANAGER_H_
 #define ASH_WM_WORKSPACE_WORKSPACE_LAYOUT_MANAGER_H_
 
 #include <memory>
 #include <set>
 
@@ skipping 80 matching lines @@
   // WindowStateObserver overrides:
   void OnPostWindowStateTypeChange(wm::WindowState* window_state,
                                    wm::WindowStateType old_type) override;
 
   // display::DisplayObserver overrides:
   void OnDisplayMetricsChanged(const display::Display& display,
                                uint32_t changed_metrics) override;
 
   // ShellObserver overrides:
   void OnFullscreenStateChanged(bool is_fullscreen,
-                                WmWindow* root_window) override;
+                                aura::Window* root_window) override;
   void OnPinnedStateChanged(aura::Window* pinned_window) override;
   void OnVirtualKeyboardStateChanged(bool activated,
                                      aura::Window* root_window) override;
 
  private:
   friend class test::WorkspaceControllerTestApi;
   typedef std::set<aura::Window*> WindowSet;
 
   // Adjusts the bounds of all managed windows when the display area changes.
   // This happens when the display size, work area insets has changed.
@@ skipping 35 matching lines @@
   ScopedObserver<keyboard::KeyboardController,
                  keyboard::KeyboardControllerObserver>
       keyboard_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(WorkspaceLayoutManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_WORKSPACE_LAYOUT_MANAGER_H_