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Removes all references to cellular network checks since they're no
longer controlling access to preload/prerender features.

Removes the enum value from NetworkPredictionStatus and
FINAL_STATUS_CELLULAR_NETWORK from prerender final status.

Change-Id: I18d55917579d02f596615743c2736b6173e559c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368361Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801163}