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This reverts commit 66870c32.

Reason for revert:
1. The root cause is not lacros, symptom is generally seen across all builders.
2. #pending tasks is ~0 now: https://chromium-swarm.appspot.com/task?id=4e21b13cf27db110&o=true&w=true.
3. 400 VMs were temporarily added to the pool to mitigate the outage.

Original change's description:
> Revert "[lacros] Enable linux-lacros-rel by default"
> 
> This reverts commit ac7726b8.
> 
> Reason for revert: reverting to shed load on CQ, crbug.com/1119483
> 
> Original change's description:
> > [lacros] Enable linux-lacros-rel by default
> > 
> > This CL enables linux-lacros-rel on CQ by default.
> > 
> > Bug: 1116180
> > Change-Id: I67bf89a5eefd7382bbd2886f416bc38c411213bf
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360496
> > Reviewed-by: Erik Staab <estaab@chromium.org>
> > Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#799123}
> 
> TBR=estaab@chromium.org,liaoyuke@chromium.org
> 
> # Not skipping CQ checks because original CL landed > 1 day ago.
> 
> Bug: 1116180, 1119483
> Change-Id: I2be0017d3af1e863ec15efaa3c3cdf1ff1764911
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364140
> Reviewed-by: Ben Pastene <bpastene@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#799798}

TBR=estaab@chromium.org,liaoyuke@chromium.org,bpastene@chromium.org

# Not skipping CQ checks because this is a reland.

Bug: 1116180
Bug: 1119483
Change-Id: Ib9211794c4eb92e3e5c721c77f4821dda49d8a0e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2365223Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799877}