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This CL rename classes and functions used by OS settings so that OS
Settings will be unaffected by the change that we made on LSS. After
the change is done, we will point OS Settings back to the main code.
See go/lss-sandboxing-impl for more details.

Bug: 1137560
Change-Id: If56dc5def738508817f4c2fa92a6d822dfdaad48
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2467161Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Jia Meng <jiameng@chromium.org>
Commit-Queue: Thanh Nguyen <thanhdng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817220}