Make WebTaskRunner ThreadSafeRefCounted

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

Index: third_party/WebKit/Source/platform/mac/ScrollAnimatorMac.mm
diff --git a/third_party/WebKit/Source/platform/mac/ScrollAnimatorMac.mm b/third_party/WebKit/Source/platform/mac/ScrollAnimatorMac.mm
index fa1161ce4499b34ba90d1509d2fb4472accbd9b4..11785abc54cefbf8ead49f9528d9dc43e63bee21 100644
--- a/third_party/WebKit/Source/platform/mac/ScrollAnimatorMac.mm
+++ b/third_party/WebKit/Source/platform/mac/ScrollAnimatorMac.mm
@@ -692,11 +692,8 @@ ScrollAnimatorBase* ScrollAnimatorBase::create(ScrollableArea* 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) {
   ThreadState::current()->registerPreFinalizer(this);