Remove keyIdentifier from KeyboardEvent factory constructor.

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 38e456c505b4dfeba5639d07c378c20bc9700e58..5ee4985d13f548775464ec5a716a92bbee77997d 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -14467,16 +14467,26 @@ class InputMethodContext extends Interceptor native "InputMethodContext" {
 @DomName('KeyboardEvent')
 class KeyboardEvent extends UIEvent native "KeyboardEvent" {
 
+  /** 
+   * Programmatically create a KeyboardEvent. 
+   *
+   * Due to browser differences, keyCode, charCode, or keyIdentifier values
+   * cannot be specified in this base level constructor. This constructor
+   * enables the user to programmatically create and dispatch a [KeyboardEvent],
+   * but it will not contain any particular key content. For programmatically
+   * creating keyboard events with specific key value contents, see the custom
+   * Event [KeyEvent]. 
+   */
   factory KeyboardEvent(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;
   }