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BF and restore navigations are allowed to use cache even when the
cache-control headers would otherwise require revalidation. When this
occurs on a previously served Search Prefetch URL, Chrome should attempt
to serve the prefetch response from cache, and then fallback to the
navigation URL on the network.

Bug: 1162121
Change-Id: I5ec8c82fe772e57acce812987efed2baa3301ed2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2605414Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Ryan Sturm <ryansturm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840219}