Remove ScrollableArea::GetFrameViewBase and move ScheduleAnimation into subclasses.

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 431 matching lines @@
   LayoutViewport().UpdateCompositorScrollAnimations();
   VisualViewport().UpdateCompositorScrollAnimations();
 }
 
 void RootFrameViewport::CancelProgrammaticScrollAnimation() {
   ScrollableArea::CancelProgrammaticScrollAnimation();
   LayoutViewport().CancelProgrammaticScrollAnimation();
   VisualViewport().CancelProgrammaticScrollAnimation();
 }
 
-FrameViewBase* RootFrameViewport::GetFrameViewBase() {
-  return VisualViewport().GetFrameViewBase();
-}
-
 void RootFrameViewport::ClearScrollableArea() {
   ScrollableArea::ClearScrollableArea();
   LayoutViewport().ClearScrollableArea();
   VisualViewport().ClearScrollableArea();
 }
 
 DEFINE_TRACE(RootFrameViewport) {
   visitor->Trace(visual_viewport_);
   visitor->Trace(layout_viewport_);
   ScrollableArea::Trace(visitor);
 }
 
 }  // namespace blink