Clean up a crash test case.
What we expect this case is just stability so output string itself is not related to test input.

BUG=

Review URL: https://codereview.chromium.org/206193003

git-svn-id: svn://svn.chromium.org/blink/trunk@169640 bbb929c8-8fbe-4397-9dbb-9b2b20218538