Folds WmRootWindowController into RootWindowController

ash/mus/bridge/wm_window_mus.h

 // Copyright 2016 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_MUS_BRIDGE_WM_WINDOW_MUS_H_
 #define ASH_MUS_BRIDGE_WM_WINDOW_MUS_H_
 
 #include <memory>
 
 #include "ash/aura/wm_window_aura.h"
@@ skipping 34 matching lines @@
     return static_cast<WmWindowMus*>(window);
   }
   static const WmWindowMus* AsWmWindowMus(const WmWindow* window) {
     return static_cast<const WmWindowMus*>(window);
   }
 
   // Returns true if this window is considered a shell window container.
   bool IsContainer() const;
 
   // WmWindow:
-  WmRootWindowController* GetRootWindowController() override;
+  ash::RootWindowController* GetRootWindowController() override;
   WmShell* GetShell() const override;
   void CloseWidget() override;
   void AddLimitedPreTargetHandler(ui::EventHandler* handler) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WmWindowMus);
 };
 
 }  // namespace mus
 }  // namespace ash
 
 #endif  // ASH_MUS_BRIDGE_WM_WINDOW_MUS_H_