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This reverts commit 0d501f4f.

Reason for revert: Added it to wrong MB config

Original change's description:
> [pgo/mac] disable widevine signing for Mac PGO bots
> 
> enable_widevine_cdm_host_verification = false was missing from
> GN args for PGO Mac bots, which is causing build failures.
> 
> Bug: 1128810
> Change-Id: I2ccd1db80e80fd983e5f4ef0bd63908281557a04
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425846
> Commit-Queue: Jeff Yoon <jeffyoon@chromium.org>
> Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
> Auto-Submit: Jeff Yoon <jeffyoon@chromium.org>
> Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#809877}

TBR=liaoyuke@chromium.org,jeffyoon@chromium.org

Change-Id: I5f4beb446367d5110d267b527df39eae12812a35
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1128810
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427343Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Jeff Yoon <jeffyoon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809891}