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This CL adds support for runtime host permissions to the Declarative Net Request
API. Changes:

- The behavior of REQUIRE_HOST_PERMISSION_FOR_URL_AND_INITIATOR is modified for
  the case when an extension has access to the initiator but the access to the
  request url is withheld. In this case, the extension is granted access to the
  request. This is similar to the current behavior of
  REQUIRE_HOST_PERMISSION_FOR_URL (used by web request API) and necessary for
  runtime host permissions to work. This allows extensions to intercept withheld
  cross-origin requests from a frame to which they have access.
- RulesetManager is modified to notify the chrome layer that access to a request
  was withheld. This is necessary for us to track an extension's
  blocked/withheld actions on a tab.

This CL also paves the way to transition the web request API to require host
permissions to the initiator i.e. REQUIRE_HOST_PERMISSION_FOR_URL_AND_INITIATOR.

BUG=157736, 809680

Change-Id: Ic4737a55a3ad6f88625149bcb39eefeb84df7d91
Reviewed-on: https://chromium-review.googlesource.com/c/1256219
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596450}