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Now that we have deprecated the Universal throughput tracker,
the aggregated throughput is no longer useful and this CL
removes related code.

Bug: 1128993
Change-Id: I96f95a9cba1f99d8e42ccdbc1c266c41b721d08d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2421760Reviewed-by: vmpstr <vmpstr@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809007}