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Update test instructions for flutter_tools (#8126)

flutter_tools testing requires the FLUTTER_TOOLS environment variable to
be set.

* Add note about ensuring that no devices are connected
C
Chris Bracken committed
948ca22923fe7fb06a79fc1400021b161b8e1a58
Parent: 5e54fd5
Committed by GitHub <noreply@github.com> on 2/14/2017, 5:31:53 AM