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This CL changes several EstimateMemoryUsage implementations to
use existing estimator functions in base::trace_events. This simplifies
the code, makes it more maintainable, and reduces the chance of error.

Bug: 1157612
Change-Id: I6fc6ee5b697013f820903ae673a1677cf02dd7e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2596059Reviewed-by: Angela Yoeurng <yoangela@chromium.org>
Commit-Queue: Orin Jaworski <orinj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838923}