Revert "WebAuthn: Update GPM touch ID UI for immediate mediation"

This reverts commit f47f65b40518fafd00ec32a0cb00de210703e18f.

Reason for revert: Test is failing on 
https://ci.chromium.org/ui/p/chromium/builders/ci/Mac13%20Tests/28861/overview

Bug: 393055190
Original change's description:
> WebAuthn: Update GPM touch ID UI for immediate mediation
>
> Cancel button, step title are renamed while the description is removed.
>
> Bug: 393055190
> Change-Id: Ib3a4af1b2913b5df150c5cfd41e3a4be3bbb828a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6519526
> Commit-Queue: Adem Derinel <derinel@google.com>
> Reviewed-by: Ken Buchanan <kenrb@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1457998}

Bug: 393055190
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I7fb6c82e0f3568bbb52f2e04f994c35ded8faa7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6530642
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Christian Dullweber <dullweber@chromium.org>
Auto-Submit: Christian Dullweber <dullweber@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1458035}