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ScrollableArea only has one subclass now. Make all it's virtual methods be pure virtual and delete any methods that RenderLayerScrollableArea overrides. Eventually we should probably merge the two classes into one, but ScrollableArea is in platform and RenderLayerScrollableArea is in core/rendering, so it's non-trivial figuring out what the end result should look like. Hopefully it will become more clear as we delete more of the scrolling code. R=abarth@chromium.org Review URL: https://codereview.chromium.org/711483003