Disable imported/wpt/workers tests.

They were imported in https://codereview.chromium.org/2405143002 with
wrong TestExpectations and are currently failing on several bots.

TBR=nhiroki@chromium.org,tkent@chromium.org
BUG=651778

Review-Url: https://codereview.chromium.org/2414033002
Cr-Commit-Position: refs/heads/master@{#425024}
1 file changed