Fixing Indexed DB from latest Blink roll

tools/dom/templates/html/impl/impl_IDBIndex.darttemplate

 // Copyright (c) 2013, 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 $LIBRARYNAME;
 
 $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
   @DomName('IDBIndex.count')
   Future<int> count([key_OR_range]) {
    try {
@@ skipping 37 matching lines @@
       bool autoAdvance}) {
     var key_OR_range = null;
     if (key != null) {
       if (range != null) {
         throw new ArgumentError('Cannot specify both key and range.');
       }
       key_OR_range = key;
     } else {
       key_OR_range = range;
     }
-    var request = _openCursor(key_OR_range, direction);
+    var request;
+    if (direction == null) {
+      request = _openCursor(key_OR_range);
+    } else {
+      request = _openCursor(key_OR_range, direction);
+    }
     return ObjectStore._cursorStreamFromResult(request, autoAdvance);
   }
 
   /**
    * Creates a stream of cursors over the records in this object store.
    *
    * See also:
    *
    * * [ObjectStore.openCursor]
    */
   Stream<Cursor> openKeyCursor({key, KeyRange range, String direction,
       bool autoAdvance}) {
     var key_OR_range = null;
     if (key != null) {
       if (range != null) {
         throw new ArgumentError('Cannot specify both key and range.');
       }
       key_OR_range = key;
     } else {
       key_OR_range = range;
     }
-    var request = _openKeyCursor(key_OR_range, direction);
+    var request;
+    if (direction == null) {
+      request = _openKeyCursor(key_OR_range);
+    } else {
+      request = _openKeyCursor(key_OR_range, direction);
+    }
     return ObjectStore._cursorStreamFromResult(request, autoAdvance);
   }
 
   $!MEMBERS
 }