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This extracts various computations of the response address space spread
out around third_party/blink/renderer to content/renderer/loader. It
prepares for moving that computation to services/network, alongside the
CORS-RFC1918 checks that compute the authoritative version of response's
address space.

This also enables easily extending the current UseCounters in
MixedContentChecker to cover the private-embedded-in-public case.

Bug: chromium:955213, chromium:1124358
Change-Id: I92642c2da8c062a51afd1fb6a783b164c4cd904b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424083
Commit-Queue: Titouan Rigoudy <titouan@chromium.org>
Auto-Submit: Titouan Rigoudy <titouan@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810621}