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This is a reland of 6966bd53

I wasn't able to repro the flake locally, but added an extra assertion
to the test to possibly get more info if this flakes again.

Original change's description:
> [WebLayer] Switch geolocation tests to use permission prompt
>
> These tests were previously using the fake permission manager which
> always grants permissions. Now we can use the real permission manager,
> and the fake permission manager can be removed.
>
> Fixes a strict mode violation in permission dialogs (similar to fixes
> from https://crrev.com/c/2108603).
>
> Bug: 1025625, 1025609
> Change-Id: I8b756c61ee213151e53d68a375ffa4d3f8fd7643
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2111061
> Commit-Queue: Clark DuVall <cduvall@chromium.org>
> Reviewed-by: John Abd-El-Malek <jam@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#752494}

TBR=jam@chromium.org

Bug: 1025625, 1025609, 1064500
Change-Id: Idb4ff08bca8ec60321b1524a9b51ec47a07b8910
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2129888Reviewed-by: Clark DuVall <cduvall@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755010}