extract TypeMemberContributor from prefixed element contributor

pkg/analysis_server/test/services/completion/dart/test_all.dart

Index: pkg/analysis_server/test/services/completion/dart/test_all.dart
diff --git a/pkg/analysis_server/test/services/completion/dart/test_all.dart b/pkg/analysis_server/test/services/completion/dart/test_all.dart
index 7479217410171733c879168856932e0c3f8d6f9b..321630da363f72c85fa42642cf7044a839648b4c 100644
--- a/pkg/analysis_server/test/services/completion/dart/test_all.dart
+++ b/pkg/analysis_server/test/services/completion/dart/test_all.dart
@@ -16,6 +16,7 @@ import 'keyword_contributor_test.dart' as keyword_test;
 import 'library_member_contributor_test.dart' as library_test;
 import 'named_constructor_contributor_test.dart' as named_contributor_test;
 import 'static_member_contributor_test.dart' as static_contributor_test;
+import 'type_member_contributor_test.dart' as type_member_contributor_test;
 import 'uri_contributor_test.dart' as uri_contributor_test;
 
 /// Utility for manually running all tests.
@@ -31,6 +32,7 @@ main() {
     library_test.main();
     named_contributor_test.main();
     static_contributor_test.main();
+    type_member_contributor_test.main();
     uri_contributor_test.main();
   });
 }