Revert "Switch libraries to using new tags."

sdk/lib/math/random.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.math;
+// A part of the dart:math library.
 
 /**
  * A random number generator. The default implementation supplies a stream of
  * pseudo-random bits which is not suitable for cryptographic purposes.
  */
 class Random {
   /**
    * Creates a random-number generator. The optional parameter [seed] is used
    * to initialize the internal state of the generator. The implementation of
    * the random stream can change between releases of the library.
@@ skipping 15 matching lines @@
    * Generates a positive random floating point value uniformly distributed on
    * the range from 0.0, inclusive, to 1.0, exclusive.
    */
   double nextDouble();
 
   /**
    * Generates a random boolean value.
    */
   bool nextBool();
 }