Mark a layout test recently improved by Skia as NeedsRebaseline.

TBR=timloh
BUG=375162

Review URL: https://codereview.chromium.org/365933002

git-svn-id: svn://svn.chromium.org/blink/trunk@177392 bbb929c8-8fbe-4397-9dbb-9b2b20218538