Revert of Mac Overlays: Add GPU back-pressure

ui/accelerated_widget_mac/accelerated_widget_mac.mm

Index: ui/accelerated_widget_mac/accelerated_widget_mac.mm
diff --git a/ui/accelerated_widget_mac/accelerated_widget_mac.mm b/ui/accelerated_widget_mac/accelerated_widget_mac.mm
index c490c4e66abfe1be5e527aba2f325235c6c7866d..82390e5d6b93005fa28da5bc69a024f451282c16 100644
--- a/ui/accelerated_widget_mac/accelerated_widget_mac.mm
+++ b/ui/accelerated_widget_mac/accelerated_widget_mac.mm
@@ -107,12 +107,6 @@
 int AcceleratedWidgetMac::GetRendererID() const {
   if (io_surface_layer_)
     return [io_surface_layer_ rendererID];
-  return 0;
-}
-
-uint32_t AcceleratedWidgetMac::GetDisplayIDForVSync() const {
-  if (view_)
-    return view_->AcceleratedWidgetGetDisplayIDForVSync();
   return 0;
 }
 
@@ -371,7 +365,7 @@
     float scale_factor,
     const gfx::Rect& pixel_damage_rect,
     const base::Closure& drawn_callback,
-    bool* disable_throttling, int* renderer_id, uint32_t* display_id) {
+    bool* disable_throttling, int* renderer_id) {
   AcceleratedWidgetMac* accelerated_widget_mac =
       GetHelperFromAcceleratedWidget(widget);
   if (accelerated_widget_mac) {
@@ -381,11 +375,9 @@
     *disable_throttling =
         accelerated_widget_mac->IsRendererThrottlingDisabled();
     *renderer_id = accelerated_widget_mac->GetRendererID();
-    *display_id = accelerated_widget_mac->GetDisplayIDForVSync();
   } else {
     *disable_throttling = false;
     *renderer_id = 0;
-    *display_id = 0;
   }
 }