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Checks that the user has allowed pre* actions before prefetching a link.

Bug: 1023486
Change-Id: Ie1f6c2315124c3cfcdc13f41ae9cf1d126fa733e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2064462Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742754}