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... the network service origin policy manager.

This is step 4 of:
https://docs.google.com/document/d/1heiIgNdO7kbaU9BLOPO4wZ9maHScB87cGT5lyjeBVAM/edit#heading=h.4en9va43fgfj

This also includes a second in memory structure for the actual policy
contents that was not present in the origin policy throttle.

Bug: 950905
Change-Id: I493e66f97c68263e1110d9ecfa724cee0ee8310f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1627036
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Auto-Submit: Andy Paicu <andypaicu@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Carlos IL <carlosil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665427}