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Finch parameter is not guaranteed to be ready on first run. This may
introduce unexpected behaviors, like the user see the notification on
second time running Chrome.

Now we always persist the first run timestamp and uses a Finch
specified timestamp from the server to check if first run happens
recently. If so then just skip the notification.

Also address an issue that origin checks for
NotificationPlatformBridgeMac is removed, now we let the empty GURL
pass.

Bug: 1047286,1046457
Change-Id: I59723c7d35230345ca9d77ccc810a07646d34b0b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032346
Commit-Queue: Xing Liu <xingliu@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737193}