Manual fixes for Dart^2 analyzer

pkg/analyzer_experimental/lib/src/error.dart

 // Copyright (c) 2013, 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.
 library error;
 
 import 'dart:collection';
 import 'dart:io';
 import 'dart:math' as math;
 
 import 'generated/error.dart';
@@ skipping 80 matching lines @@
     return builder.toString();
   }
 }
 
 // A content receiver that collects all the content into a string.
 class _ContentReceiver implements Source_ContentReceiver {
   final _buffer = new StringBuffer();
 
   String get result => _buffer.toString();
 
-  void accept1(CharBuffer contents, _) =>
-    _buffer.write(contents.subSequence(0, contents.length));
+  void accept(CharBuffer contents, _) =>
+    _buffer.write(contents.subSequence(0, contents.length()));
 
   void accept2(String contents, _) => _buffer.write(contents);
 }