Mus+Ash: Use standard cc mechanism for surface lifetime.

services/ui/ws/server_window_delegate.h

 // Copyright 2014 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 SERVICES_UI_WS_SERVER_WINDOW_DELEGATE_H_
 #define SERVICES_UI_WS_SERVER_WINDOW_DELEGATE_H_
 
 #include <memory>
 
 #include "services/ui/public/interfaces/mus_constants.mojom.h"
@@ skipping 13 matching lines @@
  public:
   virtual DisplayCompositor* GetDisplayCompositor() = 0;
 
   virtual void OnScheduleWindowPaint(ServerWindow* window) = 0;
 
   // Returns the root of the window tree to which this |window| is attached.
   // Returns null if this window is not attached up through to a root window.
   virtual const ServerWindow* GetRootWindow(
       const ServerWindow* window) const = 0;
 
-  // Schedules a callback to DestroySurfacesScheduledForDestruction() at the
-  // appropriate time, which may be synchronously.
-  virtual void ScheduleSurfaceDestruction(ServerWindow* window) = 0;
-
  protected:
   virtual ~ServerWindowDelegate() {}
 };
 
 }  // namespace ws
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_SERVER_WINDOW_DELEGATE_H_