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Adds tests verifying that fetch takes into account the CORS-RFC1918
restrictions regarding secure contexts.

These tests are ran with the CORS-RFC1918 flag as a virtual suite
because the flag currently breaks other non related tests due to
inheritance rules not being implemented.

Bug: 1138907
Change-Id: I0b5241c0ed13b4b6247310f19fdd0889351ee54b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517593
Commit-Queue: Arthur Hemery <ahemery@chromium.org>
Reviewed-by: Titouan Rigoudy <titouan@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833313}