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This CL replaces GURL with url::Origin as |security_origin|'s type.

Bug: 683115
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_site_isolation
Change-Id: I852bbd7e55ae210f32875408c6400e2057df7c5f
Reviewed-on: https://chromium-review.googlesource.com/643346Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Chandan Padhi <c.padhi@samsung.com>
Cr-Commit-Position: refs/heads/master@{#501305}