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The eligibility for showing the consent bump is checked on every
startup during the creation of the UnifiedConsentService.

Two metrics for the consent bump suppress reason are added:
 - User turned off a sync data type
 - User turned off a on-by-default privacy setting

Bug: 872435
Change-Id: I6187e88bebce1516aec72fd369281c34b89039be
Reviewed-on: https://chromium-review.googlesource.com/1188478
Commit-Queue: Thomas Tangl <tangltom@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585846}