Revert "Roll chromium_revision 74090df66c..f86a579769 (861144:861254)"

This reverts commit 14a626af56675c9d95f9fb207d53366a53a95fbd.

Reason for revert: iOS 12 bot fails consistently: https://ci.chromium.org/ui/p/webrtc/builders/ci/iOS64%20Sim%20Debug%20(iOS%2012)/5497/overview

Original change's description:
> Roll chromium_revision 74090df66c..f86a579769 (861144:861254)
>
> Change log: https://chromium.googlesource.com/chromium/src/+log/74090df66c..f86a579769
> Full diff: https://chromium.googlesource.com/chromium/src/+/74090df66c..f86a579769
>
> Changed dependencies
> * src/base: https://chromium.googlesource.com/chromium/src/base/+log/b64741b2d4..7d68e0b0d0
> * src/build: https://chromium.googlesource.com/chromium/src/build/+log/6e85f7f8aa..6936526975
> * src/ios: https://chromium.googlesource.com/chromium/src/ios/+log/171bf5f5ff..6a6c1b635a
> * src/testing: https://chromium.googlesource.com/chromium/src/testing/+log/f8f63f141a..6c578c1c05
> * src/third_party: https://chromium.googlesource.com/chromium/src/third_party/+log/68e9de796c..4b716109f3
> * src/tools: https://chromium.googlesource.com/chromium/src/tools/+log/6cf14f8442..c6fd42a430
> DEPS diff: https://chromium.googlesource.com/chromium/src/+/74090df66c..f86a579769/DEPS
>
> No update to Clang.
>
> TBR=chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com,
> BUG=None
>
> Change-Id: Id07a53e236cf61a9cd68fa785c467bfd377f0228
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/211101
> Reviewed-by: Autoroller <chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com>
> Commit-Queue: Autoroller <chromium-webrtc-autoroll@webrtc-ci.iam.gserviceaccount.com>
> Cr-Commit-Position: refs/heads/master@{#33409}

Bug: None
Change-Id: Ie9600c1f91c3bb65f2cd1d4e08a1ee561fa31eb6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/211243
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33414}