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This reverts commit 1fbe4cc4.

Reason for revert: Xcode 12 beta 3 takes more than 25 seconds to start loading content in WKWebView.

Original change's description:
> Roll bots to Xcode 12 beta 3
>
> Bots rolled with the following script:
> git grep -l '12a6163b' | xargs sed -i '' -e 's/12a6163b/12a8169fg/g'
>
> to update:
> infra/config/lib/builders.star
> infra/config/subprojects/chromium/master-only/ci.star
> infra/config/subprojects/chromium/master-only/try.star
> testing/buildbot/mixins.pyl
> testing/buildbot/waterfalls.pyl
>
> then configs were generated with:
> ./infra/config/main.star
> ./testing/buildbot/generate_buildbot_json.py
>
> CIPD packages:
>   infra_internal/ios/xcode/mac  12a8169fg
>   infra_internal/ios/xcode/ios  12a8169fg
>
> Bug: 1108576
> Change-Id: I0edaaf6d945e0f1e061d930d16194f01b17fd851
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315436
> Reviewed-by: Dirk Pranke <dpranke@google.com>
> Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#792067}

TBR=dpranke@google.com,michaeldo@chromium.org,lindsayw@chromium.org,gbeaty@chromium.org,kimstephanie@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1108576
Ignore-CQ-Freeze: Changes do not affect CQ.
Change-Id: I94996e3092c9a4f4d5961fc497c8c3e1fade0a0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2327190Reviewed-by: Erik Staab <estaab@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792824}