Revert "[iOS] Reenable testInputAccessoryBarIsPresentAfterPickers on iPhone simulator"

This reverts commit e142cf54.

Reason for revert: Test failure: https://ci.chromium.org/ui/p/chromium/builders/ci/ios-simulator-noncq/43110/blamelist

Original change's description:
> [iOS] Reenable testInputAccessoryBarIsPresentAfterPickers on iPhone simulator
>
> Reduced the number of calls to [GetFirstResponder() reloadInputViews] in didRegisterFormActivity, because this was firing every time we were switching between username and password fields, for instance. Also re-enabled testInputAccessoryBarIsPresentAfterPickers, which tests this case, on iPhone simulator, for now (will try reenabling on device also if this is successful).
>
> Bug: 325597035
> Change-Id: Ifdbe4eb82f484b6555babccb0799b48ee9fd5d26
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5380764


> Reviewed-by: Tommy Martino <tmartino@chromium.org>
> Commit-Queue: Alexis Hétu <sugoi@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1277011}

Bug: 325597035
Change-Id: I8b1280904297b402b4e5af103d904544862d5c91
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5388139


Commit-Queue: Alan Cutter <alancutter@chromium.org>
Auto-Submit: Alexis Hétu <sugoi@chromium.org>
Owners-Override: Tim Sergeant <tsergeant@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1277417}