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Reland OS Settings: Update to preprocess_grit

This is a reland of
https://chromium-review.googlesource.com/c/chromium/src/+/2487885

The build issue that caused the revert has been fixed by
https://chromium-review.googlesource.com/c/chromium/src/+/2491241

Bug: 1132403
Change-Id: I85c905a2f4294259370699b61e9de33a701f55a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490873Reviewed-by: dpapad <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819928}