Fixing Location.origin to work on non-WebKit browsers.

tools/dom/src/dart2js_LocationWrapper.dart

 // Copyright (c) 2011, 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.
 
 part of html;
 
 // On Firefox 11, the object obtained from 'window.location' is very strange.
 // It can't be monkey-patched and seems immune to putting methods on
 // Object.prototype.  We are forced to wrap the object.
 
@@ skipping 26 matching lines @@
     _set(_ptr, 'hostname', value);
   }
 
   // String href;
   String get href => _get(_ptr, 'href');
   void set href(String value) {
     _set(_ptr, 'href', value);
   }
 
   // final String origin;
-  String get origin => _get(_ptr, 'origin');
+  String get origin {
+    if (JS('bool', '("origin" in #)', _ptr)) {
+      return JS('String', '#.origin', _ptr);
+    }
+    return '${this.protocol}//${this.host}';
+  }
 
   // String pathname;
   String get pathname => _get(_ptr, 'pathname');
   void set pathname(String value) {
     _set(_ptr, 'pathname', value);
   }
 
   // String port;
   String get port => _get(_ptr, 'port');
   void set port(String value) {
@@ skipping 17 matching lines @@
   void reload() => JS('void', '#.reload()', _ptr);
 
   void replace(String url) => JS('void', '#.replace(#)', _ptr, url);
 
   String toString() => JS('String', '#.toString()', _ptr);
 
 
   static _get(p, m) => JS('var', '#[#]', p, m);
   static _set(p, m, v) => JS('void', '#[#] = #', p, m, v);
 }