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

services/ui/ws/server_window.cc

Index: services/ui/ws/server_window.cc
diff --git a/services/ui/ws/server_window.cc b/services/ui/ws/server_window.cc
index b15e52101cc96f01bd09556eaf41e21634538257..aa4cd4ab533ff5ecd6fbb9c40e179628e6deb64a 100644
--- a/services/ui/ws/server_window.cc
+++ b/services/ui/ws/server_window.cc
@@ -360,18 +360,6 @@ bool ServerWindow::IsDrawn() const {
   return root == window;
 }
 
-void ServerWindow::DestroySurfacesScheduledForDestruction() {
-  if (!surface_manager_)
-    return;
-  ServerWindowSurface* surface = surface_manager_->GetDefaultSurface();
-  if (surface)
-    surface->DestroySurfacesScheduledForDestruction();
-
-  surface = surface_manager_->GetUnderlaySurface();
-  if (surface)
-    surface->DestroySurfacesScheduledForDestruction();
-}
-
 ServerWindowSurfaceManager* ServerWindow::GetOrCreateSurfaceManager() {
   if (!surface_manager_.get())
     surface_manager_ = base::MakeUnique<ServerWindowSurfaceManager>(this);