Broaden layout test expectations for changed V8 behavior.

BUG=311164
TBR=jochen@chromium.org

Review URL: https://codereview.chromium.org/40223002

git-svn-id: svn://svn.chromium.org/blink/trunk@160448 bbb929c8-8fbe-4397-9dbb-9b2b20218538