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With this CL:
https://chromium-review.googlesource.com/c/chromium/src/+/2234063

We changed how the aggregated throughput is computed, but I forgot
to delete the old old which is the ComputeAggregatedThroughput().

This CL deletes the dead code. This is a code health CL, no
behavior change.

Change-Id: I946e215f10270827065b667893c8782a9482f30a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2285932Reviewed-by: weiliangc <weiliangc@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786431}