Revert "[Uno-D] Support kReplaceSyncPromosWithSignInPromos in SupervisedUserProfileIPHTest"

This reverts commit 68b3798299c1944412563d4956052c8cfd818c53.

Reason for revert: Suspected to cause failures. See
crbug.com/444621383#comment5

Original change's description:
> [Uno-D] Support kReplaceSyncPromosWithSignInPromos in SupervisedUserProfileIPHTest
>
> Fixed: 447099373
> Change-Id: I6a354af2d9e353777c711531bf1ffd5c24908f4d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6988928
> Reviewed-by: Ryan Sultanem <rsult@google.com>
> Commit-Queue: David Roger <droger@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1521283}

No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I8bc05ef192dde6ad3e733933a23cbf7e40be5bb9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6991650
Owners-Override: Austin Sullivan <asully@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Austin Sullivan <asully@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1521625}