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Creates class for DevTools permission overrides to maintain logic
of overrides as they get more complicated. This maintains a mapping
from URL (origin only) to PermissionTypes and their corresponding
override status. If no override status is defined, the interface
indicates this - it is up to the caller to determine what status to give
if no override is given.

Design doc: go/permission-overrides-refactor

Tested: Unit tests.
BUG: 986605
Change-Id: I0ec28e08afbcb97fb9e18f8798cf95f8a63f972d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1713436
Commit-Queue: Rohan Pavone <rohpavone@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681372}