Request new base line for layout tests due to changed V8 behavior.

The V8 roll was in https://codereview.chromium.org/65313003/.

TBR=jochen@chromium.org
BUG=316113

Review URL: https://codereview.chromium.org/68343009

git-svn-id: svn://svn.chromium.org/blink/trunk@161799 bbb929c8-8fbe-4397-9dbb-9b2b20218538