Revert of [CQ] Update proto format to fix triggered builders. (patchset #1 id:1 of https://codereview.chromium.org/1494103002/ )

Reason for revert:
Still not working...

Original issue's description:
> Reland of [CQ] Update proto format to fix triggered builders.
>
> Reason for revert:
>
> Should be fixed after
> https://chromereviews.googleplex.com/317197013/
> https://codereview.chromium.org/1487413002/
> https://codereview.chromium.org/1489293003/
>
> TBR=sergiyb@chromium.org,tandrii@chromium.org
> NOPRESUBMIT=true
> NOTRY=true
> BUG=chromium:561530
>
> Committed: https://crrev.com/224c7fa72b8002348bb876ab7a4d4fabbf9438a4
> Cr-Commit-Position: refs/heads/master@{#32544}

TBR=sergiyb@chromium.org,tandrii@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:561530

Review URL: https://codereview.chromium.org/1497583003

Cr-Commit-Position: refs/heads/master@{#32546}