Enable depot_tools_presubmit trybot for CQ.
Enable depot_tools_presubmit trybot for CQ.

The last remaining failing test is fixed now, so we
should be fine with enabling this trybot for CQ.

BUG=420910

Review URL: https://codereview.chromium.org/1149943010

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@295540 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

svn2github/chromium-depot-tools,svn2github/chromium-depot-tools,svn2github/chromium-depot-tools