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ResourceLoader is not used by network service, therefore
Net.HttpResponseInfo.ConnectionInfo.MainFrame and
Net.HttpResponseInfo.ConnectionInfo.SubResource histograms will not be
recorded after network service launches.  This CL obsoletes these two
histograms, and a follow-up CL will add new histograms in the network
service code path.

Bug: 859546
Change-Id: I37e190c1ef060642c08f95314ce52428542a5a2d
Reviewed-on: https://chromium-review.googlesource.com/1122712Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Bence Béky <bnc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572174}