Remove unintentional dependency on analysis_server

pkg/analyzer_plugin/test/src/utilities/test_all.dart

Index: pkg/analyzer_plugin/test/src/utilities/test_all.dart
diff --git a/pkg/analyzer_plugin/test/src/utilities/test_all.dart b/pkg/analyzer_plugin/test/src/utilities/test_all.dart
index 1f4ab26fbb86973268067fac1f41dfe94f5c2f70..ce38d063cb9468a458e4dfbf9a68c134eef273ea 100644
--- a/pkg/analyzer_plugin/test/src/utilities/test_all.dart
+++ b/pkg/analyzer_plugin/test/src/utilities/test_all.dart
@@ -5,9 +5,11 @@
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'change_builder/test_all.dart' as change_builder;
+import 'string_utilities_test.dart' as string_utilities;
 
 main() {
   defineReflectiveSuite(() {
     change_builder.main();
+    string_utilities.main();
   }, name: 'utilities');
 }