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- Display() Part 3: Attribute notification correctly by looking up
service worker scope from the service worker registration ID.

- Note the mojo pathway is guarded behind the NotificationsWithMojo
flag as development continues.

R=peter@chromium.org

Bug: 796991
Change-Id: I7fb7b9402cb44ee6810b29c8ed472771842fc5ed
Reviewed-on: https://chromium-review.googlesource.com/929082
Commit-Queue: Anita Woodruff <awdf@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542887}