Change IllegalArgumentException to ArgumentError.

runtime/lib/math_patch.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.
 
 // A VM patch of the dart:math library.
 patch num pow(num x, num exponent) => MathNatives.pow(x, exponent);
 patch double atan2(num a, num b) => MathNatives.atan2(a, b);
 patch double sin(num x) => MathNatives.sin(x);
 patch double cos(num x) => MathNatives.cos(x);
 patch double tan(num x) => MathNatives.tan(x);
@@ skipping 29 matching lines @@
   // The algorithm used here is Multiply with Carry (MWC) with a Base b = 2^32.
   // http://en.wikipedia.org/wiki/Multiply-with-carry
   // The constant A is selected from "Numerical Recipes 3rd Edition" p.348 B1.
   int _nextInt32() {
     _state = ((_A * (_state & _MASK_32)) + (_state >> 32)) & _MASK_64;
     return _state & _MASK_32;
   }
 
   int nextInt(int max) {
     if (max <= 0 || max > _POW2_32) {
-      throw new IllegalArgumentException("max must be positive and < 2^32:"
+      throw new ArgumentError("max must be positive and < 2^32:"
                                          " $max");
     }
     if ((max & -max) == max) {
       // Fast case for powers of two.
       return _nextInt32() & (max - 1);
     }
 
     var rnd32;
     var result;
     do {
@@ skipping 25 matching lines @@
   static int _nextSeed() {
     if (_prng == null) {
       // TODO(iposva): Use system to get a random seed.
       _prng = new Random(new Date.now().millisecondsSinceEpoch);
     }
     // Trigger the PRNG once to change the internal state.
     _prng._nextInt32();
     return _prng._state;
   }
 }