Revert "Parts must start with 'part of'" and "Attempt to fix VM build"

dart/lib/compiler/implementation/util/characters.dart

 // Copyright (c) 2011, 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 characters;
+#library("characters");
 
 const int $EOF = 0;
 const int $STX = 2;
 const int $BS  = 8;
 const int $TAB = 9;
 const int $LF = 10;
 const int $VTAB = 11;
 const int $FF = 12;
 const int $CR = 13;
 const int $SPACE = 32;
@@ skipping 110 matching lines @@
   assert(isHexDigit(hexDigit));
   // hexDigit is one of '0'..'9', 'A'..'F' and 'a'..'f'.
   if (hexDigit <= $9) return hexDigit - $0;
   return (hexDigit | ($a ^ $A)) - ($a - 10);
 }
 
 bool isUnicodeScalarValue(int value) {
   return value < $FIRST_SURROGATE ||
       (value > $LAST_SURROGATE && value <= $LAST_CODE_POINT);
 }