Need to check for positional rules on parent with style change.

A local style change on the parent inhibited checks for positional rule
changes on children with an early return. Removed that early return.

R=dstockwell@chromium.org
BUG=510732

Review URL: https://codereview.chromium.org/1264573004

git-svn-id: svn://svn.chromium.org/blink/trunk@199950 bbb929c8-8fbe-4397-9dbb-9b2b20218538
3 files changed