Update dart2js to use diagnostic kinds.

dart/tests/utils/dummy_compiler_test.dart

Index: dart/tests/utils/dummy_compiler_test.dart
diff --git a/dart/tests/utils/dummy_compiler_test.dart b/dart/tests/utils/dummy_compiler_test.dart
index 30aea67c0a73db87530f19820a4dfb8134d4b0f3..e33a1fee6f2cc68f8f1dd7cd534b278b548f85ba 100644
--- a/dart/tests/utils/dummy_compiler_test.dart
+++ b/dart/tests/utils/dummy_compiler_test.dart
@@ -40,8 +40,12 @@ Future<String> provider(Uri uri) {
   return completer.future;
 }
 
-void handler(Uri uri, int begin, int end, String message, bool fatal) {
-  print(message);
+void handler(Uri uri, int begin, int end, String message, Diagnostic kind) {
+  if (uri === null) {
+    print('$kind: $message');
+  } else {
+    print('$uri:$begin:$end: $kind: $message');
+  }
 }
 
 main() {