Revert "Create VirtualDisplayUtil interface and implement it on Mac."

This reverts commit 79fc88e3799b2ba1d01bd0d4644c4e9a759477d5.

Reason for revert: Seems to fail on CI (crbug.com/1518963). I forgot those tests don't run by default in CQ dry runs.

Original change's description:
> Create VirtualDisplayUtil interface and implement it on Mac.
>
> 1) Adds a common interface VirtualDisplayUtil which includes utilities
>    for detecting and instantiating platform specific implementations.
> 2) Adjusts VirtualDisplayMacUtil to implement VirtualDisplayUtil.
> 3) Makes VirtualDisplayMacUtil dependency on display::Screen explicit.
> 4) Adjusts some existing tests using VirtualDisplayMacUtil to use the
>    more generic VirtualDisplayUtil.
>
> Bug: 1453143
> Change-Id: Ia5009dd1b30381a846e901b66edaacb19578a153
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5166196
> Commit-Queue: Brad Triebwasser <btriebw@chromium.org>
> Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
> Reviewed-by: ccameron chromium <ccameron@chromium.org>
> Reviewed-by: Mike Wasserman <msw@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1247697}

Bug: 1453143
Change-Id: I8a7c043ebd3784bc9c5bdb9fde19a4c5f375a443
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5202432
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Tsuyoshi Horo <horo@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1247856}