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ResourcePrefetchPredictor was always using the origin of the initial
page being navigated to in constructing the NetworkIsolationKey.
With this CL, it uses the origin it expects the page to redirect to
instead.

Bug: 987735
Change-Id: Ic66c33bb5f99a9a00485ffe46c70e0947e0e430b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1730782Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Egor Pasko <pasko@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#685173}