2f9fd5ddb9097054b71fce20ba24bc34b2f084c0

BUG= Review URL: https://codereview.webrtc.org/1257163003 Cr-Commit-Position: refs/heads/master@{#9856}
Revert of Excluding two troublesome trybots from the CQ config. (patchset #1 id:1 of https://codereview.webrtc.org/1310953006/ )
Revert of Fix PRESUBMIT.py after disabling CQ. (patchset #1 id:1 of https://codereview.webrtc.org/1192673003/)
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