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Create a UserConsent object and pass it to the UserEventService.
UserConsent objects are whitelisted to not require history sync
permission as they don't contain history data. They are also
whitelisted to be sent for users who have a passphrase.

Bug: 781765
Change-Id: I13800d9b3a28d3acf44052011adcaa3d7ca172fa
Reviewed-on: https://chromium-review.googlesource.com/785912Reviewed-by: Martin Šrámek <msramek@chromium.org>
Reviewed-by: Sky Malice <skym@chromium.org>
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521671}