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These were added by https://codereview.chromium.org/6625066 for the
legacy prerender, but these are not used for the current
no-state-prefetch.

Bug: 755921
Change-Id: I7536260cbf2f33f7f99da8bfa458fdc1702bff55
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437553Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811869}