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- Ensure Settings and Close are visible always (for non-Chrome OS).
- Add "from this site" to the "block all notifications" string.

Bug: 810873,768300
Change-Id: I85eb7753614e8cd678343d06de6160b9dac5d50d
Reviewed-on: https://chromium-review.googlesource.com/913271
Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536704}