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This reverts commit f6120650.

Reason for revert: webview and weblayer test suites have a bad time today and causes the pending time spiking for Pie.
Will reland this CL once the issue is resolved.

Original change's description:
> luci: Increase CQ experimental percentage to 80 from 60 for pie-arm64-rel
>
> After the test suites adjustment in crrev.com/c/2427028, the device
> usage looks in a good shape and should be able to hold more traffc:
> http://shortn/_E2uBVeObl6
>
> Bug: 1111436
> Change-Id: I9bfb44a96feb2bc2d49ec8335afc73324711db5c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2429931
> Reviewed-by: Ben Pastene <bpastene@chromium.org>
> Commit-Queue: Haiyang Pan <hypan@google.com>
> Cr-Commit-Position: refs/heads/master@{#811298}

TBR=estaab@chromium.org,bpastene@chromium.org,hypan@google.com

Change-Id: I16bc0c24eaab0e2067c3554a9b3476d8acbbe6cc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1111436
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437009Reviewed-by: Haiyang Pan <hypan@google.com>
Commit-Queue: Haiyang Pan <hypan@google.com>
Cr-Commit-Position: refs/heads/master@{#811382}