We never paint scroll corners. The only thing we need them
for is so that the vertical and horizontal scrollbars don't
overlap each other. So, that's the only place left that
still computes a scroll corner rect.
We don't support resizers. Remove the code for them as well
as the CSS resize property.
R=abarth@chromium.org
Review URL: https://codereview.chromium.org/689283003
No change in behavior. Just deleting dead code.
Also removes ScrollAnimatorNone since it's unused.
We'll need to bring some of this back, but we'll
do that when we get rid of composited scrolling.
R=esprehn@chromium.org
Review URL: https://codereview.chromium.org/682363002
