Change IllegalArgumentException to ArgumentError.

pkg/unittest/test/matchers_test.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.
 
 #library('matcherTest');
 #import('../../../pkg/unittest/unittest.dart');
 #source('test_utils.dart');
 
 doesNotThrow() {}
 doesThrow() { throw 'X'; }
@@ skipping 77 matching lines @@
 
     test('throwsFormatException', () {
       shouldPass(() { throw new FormatException(''); },
           throwsFormatException);
       shouldFail(() { throw new Exception(); },
           throwsFormatException,
         "Expected: throws an exception which matches FormatException "
         "but:  exception <Exception> does not match FormatException.");
     });
 
-    test('throwsIllegalArgumentException', () {
-      shouldPass(() { throw new IllegalArgumentException(''); },
-          throwsIllegalArgumentException);
+    test('throwsArgumentError', () {
+      shouldPass(() { throw new ArgumentError(''); },
+          throwsArgumentError);
       shouldFail(() { throw new Exception(); },
-          throwsIllegalArgumentException,
-        "Expected: throws an exception which matches IllegalArgumentException "
+          throwsArgumentError,
+        "Expected: throws an exception which matches ArgumentError "
         "but:  exception <Exception> does not match "
-            "IllegalArgumentException.");
+            "ArgumentError.");
     });
 
     test('throwsIllegalJSRegExpException', () {
       shouldPass(() { throw new IllegalJSRegExpException('',''); },
           throwsIllegalJSRegExpException);
       shouldFail(() { throw new Exception(); },
           throwsIllegalJSRegExpException,
         "Expected: throws an exception which matches IllegalJSRegExpException "
         "but:  exception <Exception> does not match "
             "IllegalJSRegExpException.");
@@ skipping 401 matching lines @@
 
   group('Predicate Matchers', () {
     test('isInstanceOf', () {
       shouldFail(0, predicate((x) => x is String, "an instance of String"),
         "Expected: an instance of String but: was <0>.");
       shouldPass('cow', predicate((x) => x is String, "an instance of String"));
     });
   });
 }