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The behavior of NoStatePrefetch and cookies can be confusing. This adds
NoStatePrefetchBrowserTest.PrefetchCookie which documents and validates
that cookies are set on all prefetches.

Change-Id: I9c707989a07102286ae2d3e5cd19f2cbf7e29520
Reviewed-on: https://chromium-review.googlesource.com/691663
Commit-Queue: Matthew Cary <mattcary@chromium.org>
Reviewed-by: Alexandr Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505359}