Mac: Remove flag to disable threaded event handling

content/browser/renderer_host/render_view_host_impl.cc

Index: content/browser/renderer_host/render_view_host_impl.cc
diff --git a/content/browser/renderer_host/render_view_host_impl.cc b/content/browser/renderer_host/render_view_host_impl.cc
index aee80e4402c97900e1848efeb71902e4540e913c..4b8b1c22cb687cd446f22fddb6db3bdb214419eb 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -401,14 +401,6 @@ WebPreferences RenderViewHostImpl::ComputeWebkitPrefs() {
     prefs.pinch_virtual_viewport_enabled = true;
     prefs.pinch_overlay_scrollbar_thickness = 10;
   }
-#if defined(OS_MACOSX)
-  // This preference has the effect of disabling Blink's elastic overscroll,
-  // and may be removed when Blink's elastic overscroll implementation is
-  // removed.
-  // http://crbug.com/138003
-  prefs.rubber_banding_on_compositor_thread =
-      !command_line.HasSwitch(switches::kDisableThreadedEventHandlingMac);
-#endif
   prefs.use_solid_color_scrollbars = ui::IsOverlayScrollbarEnabled();
 
 #if defined(OS_ANDROID)