Add optional message to assert in Dart2js - continued

tests/compiler/dart2js/analyze_unused_dart2js_test.dart

Index: tests/compiler/dart2js/analyze_unused_dart2js_test.dart
diff --git a/tests/compiler/dart2js/analyze_unused_dart2js_test.dart b/tests/compiler/dart2js/analyze_unused_dart2js_test.dart
index 8c68b18d92064f24d938922819326cf5aa670adc..10fc5a594476a96a9f3536a2cc6b00fa81a65cf4 100644
--- a/tests/compiler/dart2js/analyze_unused_dart2js_test.dart
+++ b/tests/compiler/dart2js/analyze_unused_dart2js_test.dart
@@ -18,9 +18,10 @@ const Map<String, List<String>> WHITE_LIST = const {
   // Helper methods for debugging should never be called from production code:
   "lib/src/helpers/": const [" is never "],
 
-  // Node.asLiteralBool is never used.
+  // Node.asAssert, Node.asLiteralBool is never used.
   "lib/src/tree/nodes.dart": const [
-      "The method 'asLiteralBool' is never called"],
+      "The method 'asAssert' is never called.",
+      "The method 'asLiteralBool' is never called."],
 
   // Some things in dart_printer are not yet used
   "lib/src/dart_backend/backend_ast_nodes.dart": const [" is never "],