This reverts commit e234176b.

Reason for revert: goma problem fixed

Original change's description:
> [CQ] Temporarily drop gcc bots from CQ
> 
> NOTRY=true
> NOTREECHECKS=true
> TBR=yangguo@chromium.org
> 
> Bug: chromium:814810
> Change-Id: Ibf9d5d637f4e98a295d0cde6632679c77c3a4eb3
> Reviewed-on: https://chromium-review.googlesource.com/931921
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#51478}

TBR=machenbach@chromium.org,yangguo@chromium.org

Change-Id: Ifb4af81d4ccb784ec724d6ca4ab351f1df0db755
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:814810
Reviewed-on: https://chromium-review.googlesource.com/934801Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51527}