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

services/ui/ws/platform_display.cc

Index: services/ui/ws/platform_display.cc
diff --git a/services/ui/ws/platform_display.cc b/services/ui/ws/platform_display.cc
index 6589b40364532899af418c01ac1a941d035ecc46..c9ff1b06dd0dc3a53463dfeee57bc38af8a8dd20 100644
--- a/services/ui/ws/platform_display.cc
+++ b/services/ui/ws/platform_display.cc
@@ -298,11 +298,6 @@ ServerWindow* DefaultPlatformDisplay::GetRootWindow() {
   return delegate_->GetRootWindow();
 }
 
-void DefaultPlatformDisplay::OnCompositorFrameDrawn() {
-  if (delegate_)
-    delegate_->OnCompositorFrameDrawn();
-}
-
 bool DefaultPlatformDisplay::IsInHighContrastMode() {
   return delegate_ ? delegate_->IsInHighContrastMode() : false;
 }