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

services/ui/ws/server_window_delegate.h

Index: services/ui/ws/server_window_delegate.h
diff --git a/services/ui/ws/server_window_delegate.h b/services/ui/ws/server_window_delegate.h
index b4de30d0d14a74f614fa93726965d20a0af96619..e3bf51d06c11bcc2af9c49f4dc57fb90a2704746 100644
--- a/services/ui/ws/server_window_delegate.h
+++ b/services/ui/ws/server_window_delegate.h
@@ -31,10 +31,6 @@ class ServerWindowDelegate {
   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() {}
 };