Revert "Switch libraries to using new tags."

sdk/lib/core/int.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;
-
 /**
  * Representation of Dart integers containing integer specific
  * operations and specialization of operations inherited from [num].
  *
  * Integers can be arbitrarily large in Dart.
  *
  * *Note however, that when compiling to JavaScript, integers are
  * implemented as JavaScript numbers. When compiling to JavaScript,
  * integers are therefore restricted to 53 significant bits because
  * all JavaScript numbers are double-precision floating point
@@ skipping 55 matching lines @@
   /**
    * Parse [source] as an integer literal and return its value.
    *
    * Accepts "0x" prefix for hexadecimal numbers, otherwise defaults
    * to base-10.
    *
    * Throws a [FormatException] if [source] is not a valid integer literal.
    */
   external static int parse(String source);
 }