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Replaces GURL, CORSMode and UrlIndex parameters with UrlData.

Change-Id: I42e723381ad53c3a9d33289b3da585d5d825f587
Reviewed-on: https://chromium-review.googlesource.com/581610Reviewed-by: Fredrik Hubinette <hubbe@chromium.org>
Commit-Queue: Alok Priyadarshi <alokp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488819}