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Refactored ChromeProvidedOptionsProvider to remove redundancy and

simplify the addition of a new feature.

Change-Id: Ie0fdde88c4e48af19d4679d19eb3c11807382a6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2343218
Commit-Queue: Tanya Gupta <tgupta@chromium.org>
Reviewed-by: Kyle Milka <kmilka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800333}