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network::ResourceRequest::request_initiator is set based on
blink::ResourceRequest::RequestorOrigin. The former is a url::Origin
the latter is a scoped_refptr<const blink::SecurityOrigin>.

A file: origin is handled in a special manner in blink. Without
--allow-file-access-from-files, it is NOT opaque but it is serialized
as "null". Currently conversion from blink::SecurityOrigin to
url::Origin relies on opacity (i.e., blink::SecurityOrigin::IsOpaque)
but that is not good for CORS.

This CL changes that. With this CL, A SecurityOrigin serializes as
"null" is converted to a unique url::Origin.

Bug: 736308
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: I7b5ec4894c52499d85165689fd114e28bbd8bb97
Reviewed-on: https://chromium-review.googlesource.com/1131021Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594625}