Refactor CompilerOutput

tests/compiler/dart2js/private_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:async';
 
 import 'package:async_helper/async_helper.dart';
 import 'package:compiler/src/diagnostics/messages.dart' show MessageKind;
 import 'package:compiler/src/io/source_file.dart';
+import 'package:compiler/src/old_to_new_api.dart';
 
 import 'mock_compiler.dart';
 
 const String PRIVATE_SOURCE_URI = 'src:private';
 const String PRIVATE_SOURCE = '''
 
 var _privateVariable;
 void _privateFunction() {}
 
 class _PrivateClass {
@@ skipping 21 matching lines @@
 }
 ''';
 
 analyze(String text, [expectedWarnings]) {
   return () {
     if (expectedWarnings == null) expectedWarnings = [];
     if (expectedWarnings is! List) expectedWarnings = [expectedWarnings];
 
     MockCompiler compiler = new MockCompiler.internal(analyzeOnly: true);
     compiler.registerSource(Uri.parse(PRIVATE_SOURCE_URI), PRIVATE_SOURCE);
-    compiler.diagnosticHandler =
+    compiler.diagnosticHandler = new LegacyCompilerDiagnostics(
         (uri, int begin, int end, String message, kind) {
       SourceFile sourceFile = compiler.sourceFiles[uri.toString()];
       if (sourceFile != null) {
         print(sourceFile.getLocationMessage(message, begin, end));
       } else {
         print(message);
       }
-    };
+    });
 
     String source = '''
                     library public;
   
                     import '$PRIVATE_SOURCE_URI';
   
                     void main() {
                       PublicClass publicClass;
                       $text
                     }
@@ skipping 90 matching lines @@
         // Call public getter on public class.
         analyze('var value = publicClass.publicGetter;'),
         // Call public setter on public class.
         analyze('publicClass.publicSetter = 0;'),
         // Access public method on public class.
         analyze('var value = publicClass.publicMethod;'),
         // Call public method on public class.
         analyze('publicClass.publicMethod();'),
       ], (f) => f()));
 }