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This reverts commit 72e0b5bb.

Reason for revert: xenial builderless pool now has some idle bots
Traffics back down; should be fine to re-enable experiments.

Original change's description:
> infra: Remove all CQ experiments while the CQ is overloaded.
> 
> A small attempt at reducing overall traffic to various pools.
> 
> Bug: 1116532
> Change-Id: I9c36e08a9babfa4a69d62bb246950ae48890e94c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357412
> Reviewed-by: Erik Staab <estaab@chromium.org>
> Commit-Queue: Ben Pastene <bpastene@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#798233}

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

Change-Id: I1862724f7be1991b7545bd9ccf16c92f18e28394
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1116532
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357466Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798354}