Replace custom EngineTestCase.assertEquals() with 'unorderedEquals'.

pkg/analyzer/test/generated/utilities_test.dart

Index: pkg/analyzer/test/generated/utilities_test.dart
diff --git a/pkg/analyzer/test/generated/utilities_test.dart b/pkg/analyzer/test/generated/utilities_test.dart
index 69393344f68e00081b63f0603cdcefcf45017eed..5aea6b7dc4ef9067601e97ac2e3f40e3fc226976 100644
--- a/pkg/analyzer/test/generated/utilities_test.dart
+++ b/pkg/analyzer/test/generated/utilities_test.dart
@@ -2402,8 +2402,8 @@ class DirectedGraphTest extends EngineTestCase {
     List<List<DirectedGraphTest_Node>> topologicalSort =
         graph.computeTopologicalSort();
     expect(topologicalSort, hasLength(2));
-    EngineTestCase.assertContains(topologicalSort[0], [node3, node4]);
-    EngineTestCase.assertContains(topologicalSort[1], [node1, node2]);
+    expect(topologicalSort[0], unorderedEquals([node3, node4]));
+    expect(topologicalSort[1], unorderedEquals([node1, node2]));
   }
 }