[RootLayerScrolls] Fix frame scrolling layer in ScrollingCoordinator

third_party/WebKit/Source/core/frame/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights
    reserved.
 
    This library is free software; you can redistribute it and/or
@@ skipping 321 matching lines @@
   }
 
   enum ScrollingReasons {
     Scrollable,
     NotScrollableNoOverflow,
     NotScrollableNotVisible,
     NotScrollableExplicitlyDisabled
   };
 
   ScrollingReasons getScrollingReasons() const;
-  bool isScrollable();
+  bool isScrollable() const override;
   bool isProgrammaticallyScrollable() override;
 
   enum ScrollbarModesCalculationStrategy { RulesFromWebContentOnly, AnyRule };
   void calculateScrollbarModes(
       ScrollbarMode& hMode,
       ScrollbarMode& vMode,
       ScrollbarModesCalculationStrategy = AnyRule) const;
 
   IntPoint lastKnownMousePosition() const override;
   bool shouldSetCursor() const;
@@ skipping 888 matching lines @@
                   widget.isFrameView());
 DEFINE_TYPE_CASTS(FrameView,
                   ScrollableArea,
                   scrollableArea,
                   scrollableArea->isFrameView(),
                   scrollableArea.isFrameView());
 
 }  // namespace blink
 
 #endif  // FrameView_h