Remove some unused Net.* and DomainReliability.* histograms.

Bug: 782083, 782080, 775334, 755429, 753204
Bug: 753200, 745187, 719792, 689320, 656857
Bug: 784721
Change-Id: I5e1c231d1a286891d61349454b1dc6c13cfda295
Reviewed-on: https://chromium-review.googlesource.com/766955
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#516361}
12 files changed