Rebaseline test expectations for JSON stringify

BUG=None
TBR=cbiesinger

Review URL: https://codereview.chromium.org/186733012

git-svn-id: svn://svn.chromium.org/blink/trunk@168683 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Auto-rebaseline for r168671

http://src.chromium.org/viewvc/blink?view=revision&revision=168671

TBR=fmalita@chromium.org

Review URL: https://codereview.chromium.org/189403003

git-svn-id: svn://svn.chromium.org/blink/trunk@168684 bbb929c8-8fbe-4397-9dbb-9b2b20218538