This broke `flutter test` when running with --local-engine option:
```
02:33 +3600 ~30 -1: /usr/local/home/flutter/flutter/packages/flutter/test/foundation/stack_trace_test.dart: FlutterError.defaultStackFilter [E]
Expected: match '^#1 +Declarer\.test\.<anonymous closure>.<anonymous closure>.<anonymous closure> \(package:test_api/.+:[0-9]+:[0-9]+\)$'
Actual: '#1 Declarer.test.<anonymous closure>.<anonymous closure>.<anonymous closure> (file:///usr/local/home/.pub-cache/hosted/pub.dartlang.org/test_api-0.2.2/lib/src/backend/declarer.dart:168:27)'
````file:`-uris are incorrectly reported instead of `package:`-uris.
Can this be reverted to turn hhh-buildbot back green?
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