Change new List(n) to return fixed length list.

sdk/lib/core/string.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.core;
 
 /**
  * The String class represents sequences of characters. Strings are
  * immutable. A string is represented by a sequence of Unicode UTF-16
  * code units accessible through the [codeUnitAt] or the
@@ skipping 20 matching lines @@
    * Allocates a new String for the specified [charCode].
    *
    * The new string contains a single code unit if the [charCode] can be
    * represented by a single UTF-16 code unit. Otherwise the [length] is 2 and
    * the code units form a surrogate pair.
    *
    * It is allowed (though generally discouraged) to create a String with only
    * one half of a surrogate pair.
    */
   factory String.fromCharCode(int charCode) {
-    List<int> charCodes = new List<int>.fixedLength(1, fill: charCode);
+    List<int> charCodes = new List<int>.filled(1, charCode);
     return new String.fromCharCodes(charCodes);
   }
 
   /**
    * Gets the character (as [String]) at the given [index].
    *
    * The returned string represents exactly one UTF-16 code unit which may be
    * half of a surrogate pair. For example the Unicode character for a
    * musical G-clef ("𝄞") with rune value 0x1D11E consists of a UTF-16 surrogate
    * pair: `0xD834` and `0xDD1E`. Using the index-operator on this string yields
@@ skipping 398 matching lines @@
         _position = position - 1;
         _currentCodePoint = _combineSurrogatePair(prevCodeUnit, codeUnit);
         return true;
       }
     }
     _position = position;
     _currentCodePoint = codeUnit;
     return true;
   }
 }