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Now that per-resource updates are sent to page load metrics, we no
longer need to send totals from the renderer process. Remove all
piping/callbacks and convert existing consumers to
OnResourceDataUseObserved.

Per-resource updates:
https://chromium-review.googlesource.com/c/chromium/src/+/1164222

Change-Id: I1cb03df5e6579fc0ff767900336308a6bbad244a
Reviewed-on: https://chromium-review.googlesource.com/1178324Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: John Delaney <johnidel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584744}