Remove FrameView::containsScrollableArea

Remove FrameView::containsScrollableArea

This function does a hash lookup and is needlessly indirect. Instead, we can
just keep a bit on RenderLayerScrollableArea to remember whether we actually
scroll. I was hoping this would make the tweetus demo from famo.us faster, but
it didn't seem to have much of an effect. It's worth doing just for code
clarity, however.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=171385

[ojan, 2014-04-11 23:25:52]

lgtm

I agree that this is worth it for the code cleanup. I wonder if we can get make
m_scrollableAreas a Vector now since we only ever iterate over it now. The only
downside is that removal would be O(n), but I think that's probably OK for this.

[commit-bot: I haz the power, 2014-04-11 23:25:56]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/abarth@chromium.org/235903003/1

[commit-bot: I haz the power, 2014-04-12 00:33:48]

Change committed as 171385