Alexander Aprelev 21ad09fe57
With dart2 being default, move preview_dart_2 tests to dart1. (#15667)
* With dart being default, move preview_dart_2 tests to dart1.

* Swap out defaults for preview-dart-2 option in tests. Make dart1 explicit

* Move suffix around

* Rename files
2018-03-19 12:11:18 -07:00
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