Fix bug in previous commit

sdk/lib/io/data_transformer.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.
 
 part of dart.io;
 
 /**
  * Exposes ZLib options for input parameters.
  *
  * See http://www.zlib.net/manual.html for more documentation.
@@ skipping 465 matching lines @@
   bool _empty = true;
 
   _FilterSink(this._sink, this._filter);
 
   void add(List<int> data) {
     addSlice(data, 0, data.length, false);
   }
 
   void addSlice(List<int> data, int start, int end, bool isLast) {
     if (_closed) return;
-    if (end == null) throw ArgumentError.notNull("end");
+    if (end == null) throw new ArgumentError.notNull("end");
     RangeError.checkValidRange(start, end, data.length);
     try {
       _empty = false;
       _BufferAndStart bufferAndStart =
           _ensureFastAndSerializableByteData(data, start, end);
       _filter.process(bufferAndStart.buffer,
                       bufferAndStart.start,
                       end - (start - bufferAndStart.start));
       var out;
       while ((out = _filter.processed(flush: false)) != null) {
@@ skipping 89 matching lines @@
 }
 
 void _validateZLibStrategy(int strategy) {
   const strategies = const <int>[ZLibOption.STRATEGY_FILTERED,
       ZLibOption.STRATEGY_HUFFMAN_ONLY, ZLibOption.STRATEGY_RLE,
       ZLibOption.STRATEGY_FIXED, ZLibOption.STRATEGY_DEFAULT];
   if (strategies.indexOf(strategy) == -1) {
     throw new ArgumentError("Unsupported 'strategy'");
   }
 }