Use 'url::Origin' when processing the 'Origin' header.
Use 'url::Origin' when processing the 'Origin' header.

Rather than faking an origin with GURL::GetOrigin, we ought to do real
origin comparisons when processing the 'Origin' header during
redirection.

BUG=512374,512712

Review URL: https://codereview.chromium.org/1243983005

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#339875}

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