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This patch removes the dependency on a dynamically-generated anchor
element just to get the origin of a given string representing a URL.

Change-Id: I3fdc9416da768ca44f168622538af191093cd804
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2535051Reviewed-by: Henrik Grunell <grunell@chromium.org>
Commit-Queue: Mathias Bynens <mathias@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827743}