Remove keyIdentifier from KeyboardEvent factory constructor.

tools/dom/templates/html/dartium/impl_KeyboardEvent.darttemplate

Index: tools/dom/templates/html/dartium/impl_KeyboardEvent.darttemplate
diff --git a/tools/dom/templates/html/dartium/impl_KeyboardEvent.darttemplate b/tools/dom/templates/html/dartium/impl_KeyboardEvent.darttemplate
index a603616c504d475501e147b9c268f52e82f70c3b..73ae45dbc6dee8c66f83188abd3373111f49a53b 100644
--- a/tools/dom/templates/html/dartium/impl_KeyboardEvent.darttemplate
+++ b/tools/dom/templates/html/dartium/impl_KeyboardEvent.darttemplate
@@ -8,14 +8,14 @@ $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 
   factory $CLASSNAME(String type,
       {Window view, bool canBubble: true, bool cancelable: true,
-      String keyIdentifier: "", int keyLocation: 1, bool ctrlKey: false,
+      int keyLocation: 1, bool ctrlKey: false,
       bool altKey: false, bool shiftKey: false, bool metaKey: false,
       bool altGraphKey: false}) {
     if (view == null) {
       view = window;
     }
     final e = document.$dom_createEvent("KeyboardEvent");
-    e.$dom_initKeyboardEvent(type, canBubble, cancelable, view, keyIdentifier,
+    e.$dom_initKeyboardEvent(type, canBubble, cancelable, view, "",
         keyLocation, ctrlKey, altKey, shiftKey, metaKey, altGraphKey);
     return e;
   }