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The histograms are being recorded in code that isn't used when the
network service is enabled. It was decided that these histograms see
little enough use that it was better to remove them, rather than make
them work with the network service.

In particular, the histograms are:
Net.Prefetch.TimeSpentPrefetchingFromCache
Net.Prefetch.TimeSpentPrefetchingFromNetwork
Net.Prefetch.TimeBeforeCancel
Net.LoadPrefetch.Pattern
Net.Prefetch.Pattern
Net.Prefetch.TimeSpentOnPrefetchHit

Bug: 859535
Change-Id: Idc85a43ce4a7b2c959c419401c422d17b07e35d3
Reviewed-on: https://chromium-review.googlesource.com/1122703
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Egor Pasko <pasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572243}