Tolerate FF17's CSS2Properties

sdk/lib/_internal/compiler/implementation/lib/native_helper.dart

Index: sdk/lib/_internal/compiler/implementation/lib/native_helper.dart
diff --git a/sdk/lib/_internal/compiler/implementation/lib/native_helper.dart b/sdk/lib/_internal/compiler/implementation/lib/native_helper.dart
index ee92e5b2ecc67ef1cf78f7012be7e3c21ae5a145..98eea0219a45b27e85f188a3ba1c83a761dffd12 100644
--- a/sdk/lib/_internal/compiler/implementation/lib/native_helper.dart
+++ b/sdk/lib/_internal/compiler/implementation/lib/native_helper.dart
@@ -42,13 +42,14 @@ String typeNameInOpera(obj) {
 String typeNameInFirefox(obj) {
   String name = JS('String', '#', constructorNameFallback(obj));
   if (name == 'Window') return 'DOMWindow';
-  if (name == 'XMLDocument') return 'Document';
-  if (name == 'WorkerMessageEvent') return 'MessageEvent';
-  if (name == 'DragEvent') return 'MouseEvent';
+  if (name == 'CSS2Properties') return 'CSSStyleDeclaration';
   if (name == 'DataTransfer') return 'Clipboard';
+  if (name == 'DragEvent') return 'MouseEvent';
+  if (name == 'GeoGeolocation') return 'Geolocation';
   if (name == 'MouseScrollEvent') return 'WheelEvent';
   if (name == 'OfflineResourceList') return 'DOMApplicationCache';
-  if (name == 'GeoGeolocation') return 'Geolocation';
+  if (name == 'WorkerMessageEvent') return 'MessageEvent';
+  if (name == 'XMLDocument') return 'Document';
   return name;
 }