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Revert "Measure iOS CPU/GPU percentage (#39439)" (#40624)

This reverts commit af9f424d5db7694ad80006f97d8403500ecd9991.

Reverts flutter/flutter#39439

Reason: this passed the local device lab test on my Macbook but it failed in the actual device lab. Will investigate, fix, and reland.

TBR: @dnfield @goderbauer @tvolkert @Hixie
L
liyuqian committed
652be88ecd259407b47d0dbeb243f5fbbef81638
Parent: 390ef60
Committed by GitHub <noreply@github.com> on 9/16/2019, 10:00:27 PM