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The data collected for the following histograms have not been used recently:
- ResourcePrefetchPredictor.PrefetchingDuration
- ResourcePrefetchPredictor.ReportingEvent

Bug: 900064
Change-Id: I4f1d6b479c1a5a1f1a5c30160322acd436fcbc8c
Reviewed-on: https://chromium-review.googlesource.com/c/1343091Reviewed-by: Benoit L <lizeb@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Commit-Queue: Alexandr Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610199}