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The origin will be set if provided to the OfflineItem a non-incognito profile.
screenshot: https://lh3.googleusercontent.com/-BCLL-YuqB28/W6j_XbF542I/AAAAAAAABLA/Mq7jMbOdDdAPPZh-rfFVbDx7JIfLTKlEACL0BGAYYCw/h261/2018-09-24.png

Bug: 774612
Change-Id: I34aa8fa51195443a242e4bd6e068d2d408737fbb
Reviewed-on: https://chromium-review.googlesource.com/1240304
Commit-Queue: Rayan Kanso <rayankans@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596260}