Blink gardening: update test expectation that was broken in r159185

r159185 reverted a change, but it didn't contain expectation update.

TBR=enne@chromium.org
NOTRY=true
BUG=304986

Review URL: https://codereview.chromium.org/26655002

git-svn-id: svn://svn.chromium.org/blink/trunk@159199 bbb929c8-8fbe-4397-9dbb-9b2b20218538