Rebaseline against r155279.

I hope this clears all scrollbar pixel diffs.
No codereview URL. Too big to upload.

TBR=ccameron
BUG=133093

git-svn-id: svn://svn.chromium.org/blink/trunk@155327 bbb929c8-8fbe-4397-9dbb-9b2b20218538