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The last caller, URLLoader, can be changed simply to the new API.

Bug: 423484
Change-Id: Idd0233b098aeb78bc246580fca542e5f542b12a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893431
Commit-Queue: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711327}