Remove the presubmit-check for FAIL in test expectations.

We land test expectations with FAIL in them all the time.
This warning just seems silly.

R=abarth

Review URL: https://codereview.chromium.org/26800006

git-svn-id: svn://svn.chromium.org/blink/trunk@159762 bbb929c8-8fbe-4397-9dbb-9b2b20218538