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This CL changes DNR actions such that a list of actions is returned when
DNR rules are matched, and each action has a unique extension ID. This
is necessary for remove header rules and the action feedback API to
determine exactly which extensions removed which headers from a request.

Bug: 973211, 991420
Change-Id: Ie77a9a51a3c6761da414f8bc3a0f8747068f3717
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1758806
Commit-Queue: Kelvin Jiang <kelvinjiang@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697450}