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This will use the same permission model for downloads (only framed
contexts) when a fetch is started.

The permission will be checked every time a fetch starts (in the browser
process) to prevent race conditions.

Bug: 692647
Change-Id: Id67682cadaec3c0669d4308ac69e60447353a4e8
Reviewed-on: https://chromium-review.googlesource.com/1178281Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Mugdha Lakhani <nator@chromium.org>
Commit-Queue: Rayan Kanso <rayankans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585424}