Revert "[iOS] Add ParentAccessMediatorTest for bottom sheet timeout"

This reverts commit 9605040070c56b03a371470f88ad8bb2b372b39e.

Reason for revert: Build failed: https://ci.chromium.org/ui/p/chromium/builders/ci/ios-device/409836/overview

Original change's description:
> [iOS] Add ParentAccessMediatorTest for bottom sheet timeout
>
> Bug: 397378618
> Change-Id: I9cf92a3eb73010fa6644f1ce6a1ac58315222477
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6275071
> Reviewed-by: Nohemi Fernandez <fernandex@google.com>
> Commit-Queue: Duong Dac <ddac@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1422489}

Bug: 397378618
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: Ic5bc7fd8705d580cfa6e544217431a65682a5adb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6286467
Auto-Submit: Duong Dac <ddac@chromium.org>
Owners-Override: Duong Dac <ddac@chromium.org>
Reviewed-by: Steinar H Gunderson <sesse@chromium.org>
Commit-Queue: Duong Dac <ddac@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1422494}