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Support from throttling was added in r782103, so update the network
annotation about policies. This copies the annotation code and text
from NavigationURLLoaderImpl, etc.

Bug: 1095842
Change-Id: I9ed3baf495eafc16ed375bd23493f2e855fd8313
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425689
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809816}