Remove the test that's no longer flaky.

The bug has already been closed, just the entry wasn't cleaned up.

BUG=249707
R=ojan@chromium.org, ojan

Review URL: https://codereview.chromium.org/26210006

git-svn-id: svn://svn.chromium.org/blink/trunk@159053 bbb929c8-8fbe-4397-9dbb-9b2b20218538