Revert of Mustash: Ensure surfaces submitted to Mus by WM and embedders contain Surfaces with embeded content.

services/ui/ws/display.cc

Index: services/ui/ws/display.cc
diff --git a/services/ui/ws/display.cc b/services/ui/ws/display.cc
index 8a9cf9838f4a616d5e3400a7576cbfe5445d7bda..6314eb33cc1079fcc9b016fe8b39ece56a226428 100644
--- a/services/ui/ws/display.cc
+++ b/services/ui/ws/display.cc
@@ -271,13 +271,6 @@
   return root_.get();
 }
 
-ServerWindow* Display::GetActiveRootWindow() {
-  WindowManagerDisplayRoot* display_root = GetActiveWindowManagerDisplayRoot();
-  if (display_root)
-    return display_root->root();
-  return nullptr;
-}
-
 void Display::OnAcceleratedWidgetAvailable() {
   display_manager()->OnDisplayAcceleratedWidgetAvailable(this);
   InitWindowManagerDisplayRoots();