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I got a crash earlier today where WillProcessResponse was being called
on a non-preview page without response headers, so the DCHECK failed.

Moving up the early return makes the navigation throttle more robust
against this in the future.

Bug: 864635
Change-Id: Ief8e3b2b0ac9179d2ba16ff8f04c950b08f9564d
Reviewed-on: https://chromium-review.googlesource.com/c/1265059
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597182}