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URLs like `https://whatever.com:0/` have an opaque origin, as they're
rejected in the SchemeHostPort constructor (see [1] and [2]). This
means that they fail the `IsOriginSecure()` check, and crash the
renderer, which is a bit unfortunate, as they're going to fail to load
regardless.

This patch excludes URLs with opaque origins from the referrer check in
order to avoid that crash.

[1]: https://cs.chromium.org/chromium/src/url/scheme_host_port.h?rcl=90e84c7240870d52c224cb8c07b52545a2ef7cef&l=83
[2]: https://cs.chromium.org/chromium/src/url/scheme_host_port.cc?rcl=90e84c7240870d52c224cb8c07b52545a2ef7cef&l=85

Bug: 960312
Change-Id: I39a41e3148554fda36e52d1f0c9934f52a2b8dff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1771906
Commit-Queue: Mike West <mkwst@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691093}