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This adds an additional check to prevent non-DataSaver users from
registering optimization types with the the Optimziation Guide
even though they would not be used within Previews code.


Bug: 1042429
Change-Id: Ibf6073aafcdde35939122f0b043b0c5b53b573bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2097558
Commit-Queue: Michael Crouse <mcrouse@chromium.org>
Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749224}