Remove deprecated string features.

sdk/lib/utf/utf16.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.
 
 part of dart.utf;
 
 /**
  * Decodes the UTF-16 bytes as an iterable. Thus, the consumer can only convert
  * as much of the input as needed. Determines the byte order from the BOM,
  * or uses big-endian as a default. This method always strips a leading BOM.
@@ skipping 160 matching lines @@
  * little-endian byte-order marker (BOM).
  */
 bool hasUtf16leBom(List<int> utf16EncodedBytes, [int offset = 0, int length]) {
   int end = length != null ? offset + length : utf16EncodedBytes.length;
   return (offset + 2) <= end &&
       utf16EncodedBytes[offset] == UNICODE_UTF_BOM_LO &&
       utf16EncodedBytes[offset + 1] == UNICODE_UTF_BOM_HI;
 }
 
 List<int> _stringToUtf16CodeUnits(String str) {
-  return _codepointsToUtf16CodeUnits(str.charCodes);
+  return _codepointsToUtf16CodeUnits(str.codeUnits);
 }
 
 typedef _ListRangeIterator _CodeUnitsProvider();
 
 /**
  * Return type of [decodeUtf16AsIterable] and variants. The Iterable type
  * provides an iterator on demand and the iterator will only translate bytes
  * as requested by the user of the iterator. (Note: results are not cached.)
  */
 // TODO(floitsch): Consider removing the extend and switch to implements since
@@ skipping 136 matching lines @@
   }
 
   int decode() {
     utf16EncodedBytesIterator.moveNext();
     int lo = utf16EncodedBytesIterator.current;
     utf16EncodedBytesIterator.moveNext();
     int hi = utf16EncodedBytesIterator.current;
     return (hi << 8) + lo;
   }
 }