tree a65f16053e646ad812491f1276b10bae9e0a95f2
parent 069cddaa6711044f1664dc483769b1ccb635d04d
author Mehmet Fidanboylu <mehmetf@users.noreply.github.com> 1536889821 -0700
committer GitHub <noreply@github.com> 1536889821 -0700
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Make Flutter repo Dart SDK 2.1-dev3.1 compatible (#21853)

This is a blocker for Google roll since we are not at dev4.0:
- Future is not yet part of dart:core.
- Future.sync().then<dynamic>... causes failure without the new keyword.