Update imports to use package:compiler and package:try.

dart/tests/compiler/dart2js/simple_inferrer_test.dart

Index: dart/tests/compiler/dart2js/simple_inferrer_test.dart
diff --git a/dart/tests/compiler/dart2js/simple_inferrer_test.dart b/dart/tests/compiler/dart2js/simple_inferrer_test.dart
index 10d4d66c96d5f4a7615f56db2ed154fc05851718..18409d80b108b21f83cbdf8b2f3af8eac8f03c27 100644
--- a/dart/tests/compiler/dart2js/simple_inferrer_test.dart
+++ b/dart/tests/compiler/dart2js/simple_inferrer_test.dart
@@ -4,9 +4,7 @@
 
 import 'package:expect/expect.dart';
 import "package:async_helper/async_helper.dart";
-import
-    '../../../sdk/lib/_internal/compiler/implementation/types/types.dart'
-    show TypeMask;
+import 'package:compiler/implementation/types/types.dart' show TypeMask;
 import 'type_mask_test_helper.dart';
 
 import 'compiler_helper.dart';