Force auto roll of chromium third_party into WebRTC to fail if any one
of required chromium-specific dependencies is missing in chromium
third_party repo of after checking it into WebRTC repo.
Also try to fix some flakes in autoroller.
Bug: webrtc:8366
Change-Id: I781cd4d4a4a230fb126cc32d8147310f70ab8b91
Reviewed-on: https://webrtc-review.googlesource.com/77722
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23340}