Make WebTaskRunner ThreadSafeRefCounted

third_party/WebKit/Source/platform/mac/ScrollAnimatorMac.mm

 /*
  * Copyright (C) 2010, 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 673 matching lines @@
 @end
 
 namespace blink {
 
 ScrollAnimatorBase* ScrollAnimatorBase::create(ScrollableArea* scrollableArea) {
   return new ScrollAnimatorMac(scrollableArea);
 }
 
 ScrollAnimatorMac::ScrollAnimatorMac(ScrollableArea* scrollableArea)
     : ScrollAnimatorBase(scrollableArea),
-      m_taskRunner(Platform::current()
-                       ->currentThread()
-                       ->scheduler()
-                       ->timerTaskRunner()
-                       ->clone()),
+      m_taskRunner(
+          Platform::current()->currentThread()->scheduler()->timerTaskRunner()),
       m_haveScrolledSincePageLoad(false),
       m_needsScrollerStyleUpdate(false) {
   m_scrollAnimationHelperDelegate.adoptNS(
       [[BlinkScrollAnimationHelperDelegate alloc] initWithScrollAnimator:this]);
   m_scrollAnimationHelper.adoptNS(
       [[NSClassFromString(@"NSScrollAnimationHelper") alloc]
           initWithDelegate:m_scrollAnimationHelperDelegate.get()]);
 
   m_scrollbarPainterControllerDelegate.adoptNS(
       [[BlinkScrollbarPainterControllerDelegate alloc]
@@ skipping 368 matching lines @@
     rectInViewCoordinates =
         verticalScrollbar->convertToContainingWidget(scrollerThumb);
 
   if (rectInViewCoordinates == m_visibleScrollerThumbRect)
     return;
 
   m_visibleScrollerThumbRect = rectInViewCoordinates;
 }
 
 }  // namespace blink