Switch AutoscrollController to use animation system instead of timer

Source/core/loader/FrameLoader.cpp

Index: Source/core/loader/FrameLoader.cpp
diff --git a/Source/core/loader/FrameLoader.cpp b/Source/core/loader/FrameLoader.cpp
index 4b3db84303fd77417009ede4fe373fbce15d4802..3df9066d45491f0a8f7116a50f265fb9131788c7 100644
--- a/Source/core/loader/FrameLoader.cpp
+++ b/Source/core/loader/FrameLoader.cpp
@@ -578,7 +578,7 @@ void FrameLoader::loadInSameDocument(const KURL& url, PassRefPtr<SerializedScrip
     // If we were in the autoscroll/panScroll mode we want to stop it before following the link to the anchor
     bool hashChange = equalIgnoringFragmentIdentifier(url, oldURL) && url.fragmentIdentifier() != oldURL.fragmentIdentifier();
     if (hashChange) {
-        m_frame->eventHandler().stopAutoscrollTimer();
+        m_frame->eventHandler().stopAutoscroll();
         m_frame->domWindow()->enqueueHashchangeEvent(oldURL, url);
     }
     m_documentLoader->setIsClientRedirect((m_startingClientRedirect && !isNewNavigation) || !UserGestureIndicator::processingUserGesture());