Disable timing out perf tests.

BUG=384857
TBR=tonyg@chromium.org
NOTRY=True
NOTREECHECKS=True

Review URL: https://codereview.chromium.org/336093002

git-svn-id: svn://svn.chromium.org/blink/trunk@176165 bbb929c8-8fbe-4397-9dbb-9b2b20218538