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In particular, this affects the "See what's new" button on the Settings
About page and the Release Notes notification.

- Also added Notification as an App Launch Source.

Bug: b/159394556
Change-Id: Icc498f4c571098c922a8da29003fc8780d386ec0
Cq-Include-Trybots: chrome/try:linux-chromeos-chrome
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352459
Commit-Queue: Callistus Tan <callistus@google.com>
Reviewed-by: Rachel Carpenter <carpenterr@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799521}