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Before this CL, we'd show a pop-up notification for any new
notifications (corresponding to new notification IDs), but we'd silently
update the notification content whenever it was updated.

However, many messaging apps use the same notification ID for a single
chat thread and just replace the text content with new content when a
new message is received. This meant that when users received a new
message from the same recipient, the new notification would not pop up.

This CL fixes the issue by always popping up updated notifications.

Fixed: 1159063
Bug: 1106937
Change-Id: I21aa76368d8de63068a12ad23c65fd4ecc4d3a4d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2606109Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839759}