Update tests.

tests/compiler/dart2js/no_duplicate_constructor_body_test.dart

Index: tests/compiler/dart2js/no_duplicate_constructor_body_test.dart
diff --git a/tests/compiler/dart2js/no_duplicate_constructor_body_test.dart b/tests/compiler/dart2js/no_duplicate_constructor_body_test.dart
index 127be93105babaed7cad1d76ac23f1e38642d568..3005ddfa3dd52b7a5a008a1f95bcef82ab1bc711 100644
--- a/tests/compiler/dart2js/no_duplicate_constructor_body_test.dart
+++ b/tests/compiler/dart2js/no_duplicate_constructor_body_test.dart
@@ -17,7 +17,7 @@ main() {
 
 main() {
   asyncTest(() => compileAll(CODE).then((generated) {
-    RegExp regexp = new RegExp(r'\A: {[ \n]*"": "[A-za-z]+;"');
+    RegExp regexp = new RegExp(r'\A: {[ \n]*"\^": "[A-za-z]+;"');
     Iterator<Match> matches = regexp.allMatches(generated).iterator;
     checkNumberOfMatches(matches, 1);
   }));