Revert "Remove feature parameters in favor of grit strings."

This reverts commit ca85f83f8fb1e33cd04da057a7d950e213135ed9.

Reason for revert: Breaking tests on ios waterfall https://ci.chromium.org/ui/p/chromium/builders/ci/ios-simulator-full-configs/54136/overview

Original change's description:
> Remove feature parameters in favor of grit strings.
>
> There is no need for feature parameters to set UI strings, as those can
> be set directly in the finch config.
>
> Bug: 327716672
> Change-Id: If4ec85301c97da882d212b4fb6e013aafd94a3b6
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5335343
> Commit-Queue: Jan Keitel <jkeitel@google.com>
> Reviewed-by: Colin Blundell <blundell@chromium.org>
> Reviewed-by: Dana Fried <dfried@chromium.org>
> Reviewed-by: Bruno Braga <brunobraga@google.com>
> Cr-Commit-Position: refs/heads/main@{#1269162}

Bug: 327716672
Change-Id: Iccb1a6cf3477266af958442bcfa5fa8348b3e470
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5350880
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Auto-Submit: Chris Lu <thegreenfrog@chromium.org>
Owners-Override: Chris Lu <thegreenfrog@google.com>
Cr-Commit-Position: refs/heads/main@{#1269390}