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We need to handle it in the browser for navigation redirects;
which by upcoming security rules means that the network service
should parse it, which requires the code to be in services/network

The renderer also needs to parse it, so it needs to be in
services/network/public/cpp.

Also ParseAceptCH got split into ParseAcceptCH and FilterAcceptCH along the way,
since it feels like network service shouldn't know about browser
experiments on what hints to support.

Bug: 1050726
Change-Id: I4b10ce6ddf97efd852a44d4c8a4f85a9a6a0c404
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2124734
Commit-Queue: Maksim Orlovich <morlovich@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756826}