Change IllegalArgumentException to ArgumentError.

runtime/lib/byte_array.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.
 
 patch class Int8List {
   /* patch */ factory Int8List(int length) {
     return new _Int8Array(length);
   }
 
   /* patch */ factory Int8List.view(ByteArray array,
@@ skipping 305 matching lines @@
   if (start + length > listLength) {
     throw new IndexOutOfRangeException(start + length);
   }
 }
 
 
 int _requireInteger(object) {
   if (object is int) {
     return object;
   }
-  throw new IllegalArgumentException("$object is not an integer");
+  throw new ArgumentError("$object is not an integer");
 }
 
 
 int _requireIntegerOrNull(object, value) {
   if (object is int) {
     return object;
   }
   if (object === null) {
     return _requireInteger(value);
   }
-  throw new IllegalArgumentException("$object is not an integer or null");
+  throw new ArgumentError("$object is not an integer or null");
 }
 
 
 class _Int8Array extends _ByteArrayBase implements Int8List {
   factory _Int8Array(int length) {
     return _new(length);
   }
 
   factory _Int8Array.view(ByteArray array, [int start = 0, int length]) {
     if (length === null) {
@@ skipping 2062 matching lines @@
     }
     _rangeCheck(this.length, start, length);
     return _array.subByteArray(_offset + start, length);
   }
 
   static const int _BYTES_PER_ELEMENT = 8;
   final ByteArray _array;
   final int _offset;
   final int _length;
 }