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More consistent temp directory naming (#42063)

Applying our style guide:
https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#have-good-hygiene-when-using-temporary-directories
I
Ian Hickson committed
cdc2d9901d1fb42c7f506b9413d12aec1b1abee8
Parent: 9529d67
Committed by GitHub <noreply@github.com> on 10/7/2019, 11:43:04 PM