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ResourceLoadScheduler.{Traffic|Decoded}Bytes.{Main|Sub}frame(Not)?Throttled
were introduced to measure loading traffic and data amount per
throttling state and frame types. After the first introduction,
ResourceLoadScheduler.{Traffic|Decoded}Bytes.KBPerFrameStatus were also
introduced as metrics that can replace them, and are easy to be compared.

This patch removes measuring code for the older metrics, and marks
histogram items as obsolete.

Bug: 854016, 854019
Change-Id: I5eb469c9699060c0018437097d9cfc4940c4c19a
Reviewed-on: https://chromium-review.googlesource.com/1157952Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580831}