Fixing Indexed DB from latest Blink roll

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

Index: tools/dom/templates/html/impl/impl_IDBIndex.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_IDBIndex.darttemplate b/tools/dom/templates/html/impl/impl_IDBIndex.darttemplate
index 44f866cc202b339851c34f54c27c36c31248cb50..03af72c15d2956108700de3606805e58b74221c1 100644
--- a/tools/dom/templates/html/impl/impl_IDBIndex.darttemplate
+++ b/tools/dom/templates/html/impl/impl_IDBIndex.darttemplate
@@ -55,7 +55,12 @@ $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
     } 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);
   }
 
@@ -77,7 +82,12 @@ $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
     } 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);
   }