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Adds a notification showing the user's email and avatar when cookies
have been re-generated for their account.

Bug: 1145592
Change-Id: I4a74c38f15a17ef9ec8d85632ca8b95dbca3fed8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2520996
Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Chris Lu <thegreenfrog@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824602}