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Remove devicelab mac android tasks from manifest.yaml (#74459)

All these tests are already running in luci and were added to
prod_builders.json file.

Bug: https://github.com/flutter/flutter/issues/71960
Bug: https://github.com/flutter/flutter/issues/74059
G
godofredoc committed
1f07fde45d7b542e09117161e4b90c0096cbeeed
Parent: f67d696
Committed by GitHub <noreply@github.com> on 1/22/2021, 3:15:35 AM