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This removes protocol types used for response headers and auth
challenge from InterceptedRequestInfo and replaces them with

net: :HttpResponseHeaders and net::AuthChallengeInfo.
Change-Id: I4fa916d0d6bf77a9c4de183396372a87948992c7
Reviewed-on: https://chromium-review.googlesource.com/c/1297573
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602386}