GitLab

Replace its usage by lint-test-expectations and run-webkit-tests, both
scripts found in third_party/WebKit/Tools/Scripts.

BUG=338338
TEST=None
R=dpranke@chromium.org,cmp@chromium.org

Review URL: https://codereview.chromium.org/603563002

Cr-Commit-Position: refs/heads/master@{#296883}