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Since permission delegation is enabled by default and the flag is soon
to be entirely removed, this CL removes specific notification permission
logic that pre-dates permission delegation.

The CL should be a no-op except for file origins which currently have
issues in the permission architecture (see towards the end of
crbug.com/444047).

Bug: 995457
Change-Id: I9d502b4ffbb18789b07ef5c336714aba5c05157f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315692Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791387}