Add access the Message in CompilerDiagnostics.report.

pkg/compiler/lib/src/old_to_new_api.dart

Index: pkg/compiler/lib/src/old_to_new_api.dart
diff --git a/pkg/compiler/lib/src/old_to_new_api.dart b/pkg/compiler/lib/src/old_to_new_api.dart
index 34d6e79d019f293ccff6104a5b5b33abc3dd9ae5..59bbc19a37c1d1cba48573f87ca8b8a456f4d677 100644
--- a/pkg/compiler/lib/src/old_to_new_api.dart
+++ b/pkg/compiler/lib/src/old_to_new_api.dart
@@ -31,8 +31,8 @@ class LegacyCompilerDiagnostics implements CompilerDiagnostics {
   LegacyCompilerDiagnostics(this._handler);
 
   @override
-  void report(Uri uri, int begin, int end,
-                        String message, Diagnostic kind) {
+  void report(var code, Uri uri, int begin, int end,
+              String message, Diagnostic kind) {
     _handler(uri, begin, end, message, kind);
   }
 }