Make common tests consistent

pkg/analyzer_plugin/test/utilities/completion/type_member_contributor_test.dart

Index: pkg/analyzer_plugin/test/utilities/completion/type_member_contributor_test.dart
diff --git a/pkg/analyzer_plugin/test/utilities/completion/type_member_contributor_test.dart b/pkg/analyzer_plugin/test/utilities/completion/type_member_contributor_test.dart
index e20842942b10a879c4df97af66eebeb1e4c4e7e1..19b5e83ba2b24ddd3c9ebabfb48670e59195e6e9 100644
--- a/pkg/analyzer_plugin/test/utilities/completion/type_member_contributor_test.dart
+++ b/pkg/analyzer_plugin/test/utilities/completion/type_member_contributor_test.dart
@@ -3556,7 +3556,6 @@ void main() {C.^ print("something");}''');
     assertSuggestGetter('length', 'int');
   }
 
-//  @soloTest
   test_PrefixedIdentifier_trailingStmt_const_untyped() async {
     // SimpleIdentifier  PrefixedIdentifier  ExpressionStatement
     addTestSource('const g = "hello"; f() {g.^ int y = 0;}');