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Before this CL, IsSameSite helper function in
services/network/sec_header_helpers.cc would only compare |initiator|'s
and |target_origin|'s hosts, which meant that a request with:
  - initiator = http://foo.example.com
  - target = https://foo.example.com
would be sent with:
  Sec-Fetch-Site: same-site

After this CL, IsSameSite also compares schemes (but not ports) to match
Site Isolation's notion of a site and so the request above will use:
  Sec-Fetch-Site: cross-site

Bug: 979257
Change-Id: I9b27a1118cdda8cfc02bf07ac697fc8d591d6b77
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1680096Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Auto-Submit: Łukasz Anforowicz <lukasza@chromium.org>
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676649}