Mac: Remove flag to disable threaded event handling

content/browser/renderer_host/render_view_host_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_view_host_impl.h"
 
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 383 matching lines @@
   prefs.text_blobs_enabled = command_line.HasSwitch(switches::kForceTextBlobs)
       || (content::IsImplSidePaintingEnabled() &&
           !command_line.HasSwitch(switches::kDisableTextBlobs));
   prefs.region_based_columns_enabled =
       command_line.HasSwitch(switches::kEnableRegionBasedColumns);
 
   if (IsPinchVirtualViewportEnabled()) {
     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)
   // On Android, user gestures are normally required, unless that requirement
   // is disabled with a command-line switch or the equivalent field trial is
   // is set to "Enabled".
   const std::string autoplay_group_name = base::FieldTrialList::FindFullName(
       "MediaElementAutoplay");
   prefs.user_gesture_required_for_media_playback = !command_line.HasSwitch(
       switches::kDisableGestureRequirementForMediaPlayback) &&
@@ skipping 987 matching lines @@
   FrameTree* frame_tree = delegate_->GetFrameTree();
 
   frame_tree->ResetForMainFrameSwap();
 }
 
 void RenderViewHostImpl::SelectWordAroundCaret() {
   Send(new ViewMsg_SelectWordAroundCaret(GetRoutingID()));
 }
 
 }  // namespace content