Revert of Enable BeginFrame scheduling on aura

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index 6eb57c9c71f99f5dc080364546e23fb227161635..f3f6489daee1f0e3dec61487b979322f8e8fe52d 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -233,13 +233,12 @@
     settings.use_compositor_animation_timelines = true;
     blink::WebRuntimeFeatures::enableCompositorAnimationTimelines(true);
   }
-#if !defined(OS_MACOSX)
-  if (!widget_->for_oopif()) {
+  if (cmd->HasSwitch(switches::kEnableBeginFrameScheduling) &&
+      !widget_->for_oopif()) {
     // TODO(simonhong): Apply BeginFrame scheduling for OOPIF.
     // See crbug.com/471411.
     settings.use_external_begin_frame_source = true;
   }
-#endif
 
   settings.default_tile_size = CalculateDefaultTileSize(widget_);
   if (cmd->HasSwitch(switches::kDefaultTileWidth)) {