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Shim package:test to avoid matcher issues (#20602)

* Upgrade everything except matcher.
* Roll matcher (and test)
* Adjust tests that depend on flutter:test directly to depend on a shim
* Require use of package:test shim and remove other references to package:test
I
Ian Hickson committed
686d8f8a22a8ad03375c0b7b8a2442831652190b
Parent: 8de0e15
Committed by Todd Volkert <tvolkert@users.noreply.github.com> on 8/15/2018, 3:33:58 AM