Change IllegalArgumentException to ArgumentError.

runtime/bin/http_impl.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.
 
 class _HttpHeaders implements HttpHeaders {
   _HttpHeaders() : _headers = new Map<String, List<String>>();
 
   List<String> operator[](String name) {
     name = name.toLowerCase();
     return _headers[name];
@@ skipping 1950 matching lines @@
     return _open(method, host, port, path);
   }
 
   HttpClientConnection _open(String method,
                              String host,
                              int port,
                              String path,
                              [_HttpClientConnection connection]) {
     if (_shutdown) throw new HttpException("HttpClient shutdown");
     if (method == null || host == null || port == null || path == null) {
-      throw new IllegalArgumentException(null);
+      throw new ArgumentError(null);
     }
     return _prepareHttpClientConnection(host, port, method, path, connection);
   }
 
   HttpClientConnection openUrl(String method, Uri url) {
     _openUrl(method, url);
   }
 
   HttpClientConnection _openUrl(String method,
                                 Uri url,
@@ skipping 197 matching lines @@
 
 
 class _RedirectInfo implements RedirectInfo {
   const _RedirectInfo(int this.statusCode,
                       String this.method,
                       Uri this.location);
   final int statusCode;
   final String method;
   final Uri location;
 }