Reland "[CrOS SplitSettings] Fork OS reset settings into new files"

This is a reland of 690cf93acba5bf05d112f42ae6cc594fcfbf045c

Original change's description:
> [CrOS SplitSettings] Fork OS reset settings into new files
>
> Remove all browser reset settings.
> Hide OS specific settings in Browser settings.
>
> Bug: 950007
> Change-Id: Ic8ab799a8c96dd5fd6612f2aab06eec957cfc51e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1599514
> Commit-Queue: Regan Hsu <hsuregan@chromium.org>
> Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#657897}

Bug: 950007
Change-Id: I8a8f3d95c83f61adfe8dc458d37139161240c9b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1604362
Commit-Queue: Regan Hsu <hsuregan@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662497}
16 files changed