Scrollbar no longer inherits from FrameViewBase.

third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp

Index: third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
index a8cd0c368cf6e3f4833c6d9f6450754fac81772c..23d1185d2bfdf45e79abc1c9582fa4eae0e38004 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
@@ -1991,7 +1991,7 @@ Scrollbar* PaintLayerScrollableArea::ScrollbarManager::CreateScrollbar(
         ScrollableArea(), orientation, scrollbar_size,
         &ScrollableArea()->Box().GetFrame()->GetPage()->GetChromeClient());
   }
-  ScrollableArea()->Box().GetDocument().View()->AddChild(scrollbar);
+  ScrollableArea()->Box().GetDocument().View()->AddScrollbar(scrollbar);
   return scrollbar;
 }
 
@@ -2013,7 +2013,7 @@ void PaintLayerScrollableArea::ScrollbarManager::DestroyScrollbar(
   if (!scrollbar->IsCustomScrollbar())
     ScrollableArea()->WillRemoveScrollbar(*scrollbar, orientation);
 
-  ToFrameView(scrollbar->Parent())->RemoveChild(scrollbar.Get());
+  ScrollableArea()->Box().GetDocument().View()->RemoveScrollbar(scrollbar);
   scrollbar->DisconnectFromScrollableArea();
   scrollbar = nullptr;
 }