Implement overlay scrollbar fade out for non-composited scrollers.

third_party/WebKit/Source/core/frame/RootFrameViewport.cpp

 // Copyright 2015 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 "core/frame/RootFrameViewport.h"
 
 #include "core/frame/FrameView.h"
 #include "core/layout/ScrollAlignment.h"
 #include "core/layout/ScrollAnchor.h"
 #include "platform/geometry/DoubleRect.h"
@@ skipping 429 matching lines @@
 void RootFrameViewport::cancelProgrammaticScrollAnimation() {
   ScrollableArea::cancelProgrammaticScrollAnimation();
   layoutViewport().cancelProgrammaticScrollAnimation();
   visualViewport().cancelProgrammaticScrollAnimation();
 }
 
 Widget* RootFrameViewport::getWidget() {
   return visualViewport().getWidget();
 }
 
-void RootFrameViewport::clearScrollAnimators() {
-  ScrollableArea::clearScrollAnimators();
-  layoutViewport().clearScrollAnimators();
-  visualViewport().clearScrollAnimators();
+void RootFrameViewport::clearScrollableArea() {
+  ScrollableArea::clearScrollableArea();
+  layoutViewport().clearScrollableArea();
+  visualViewport().clearScrollableArea();
 }
 
 DEFINE_TRACE(RootFrameViewport) {
   visitor->trace(m_visualViewport);
   visitor->trace(m_layoutViewport);
   ScrollableArea::trace(visitor);
 }
 
 }  // namespace blink