Change IllegalArgumentException to ArgumentError.

lib/uri/uri.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('dart:uri');
 
 #import('dart:math');
 #import('dart:utf');
 
 #source('encode_decode.dart');
@@ skipping 163 matching lines @@
                                   query: targetQuery,
                                   fragment: reference.fragment);
   }
 
   bool hasAuthority() {
     return (userInfo != "") || (domain != "") || (port != 0);
   }
 
   /**
    * For http/https schemes returns URI's [origin][] - scheme://domain:port.
-   * For all other schemes throws IllegalArgumentException.
+   * For all other schemes throws ArgumentError.
    * [origin]: http://www.w3.org/TR/2011/WD-html5-20110405/origin-0.html#origin
    */
   String get origin {
     if (scheme == "") {
       // TODO(aprelev@gmail.com): Use StateException instead
-      throw new IllegalArgumentException("Cannot use origin without a scheme");
+      throw new ArgumentError("Cannot use origin without a scheme");
     }
     if (scheme != "http" && scheme != "https") {
       // TODO(aprelev@gmail.com): Use StateException instead
-      throw new IllegalArgumentException(
+      throw new ArgumentError(
         "origin is applicable to http/https schemes only. Not \'$scheme\'");
     }
     StringBuffer sb = new StringBuffer();
     sb.add(scheme);
     sb.add(":");
     if (domain == null || domain == "") {
       // TODO(aprelev@gmail.com): Use StateException instead
-      throw new IllegalArgumentException("Cannot use origin without a domain");
+      throw new ArgumentError("Cannot use origin without a domain");
     }
 
     sb.add("//");
     sb.add(domain);
     if (port != 0) {
       sb.add(":");
       sb.add(port);
     }
     return sb.toString();
   }
@@ skipping 17 matching lines @@
   }
 
   static void _addIfNonEmpty(StringBuffer sb, String test,
                              String first, String second) {
     if ("" != test) {
       sb.add(first === null ? "null" : first);
       sb.add(second === null ? "null" : second);
     }
   }
 }