Fixing Indexed DB from latest Blink roll

sdk/lib/indexed_db/dartium/indexed_db_dartium.dart

Index: sdk/lib/indexed_db/dartium/indexed_db_dartium.dart
diff --git a/sdk/lib/indexed_db/dartium/indexed_db_dartium.dart b/sdk/lib/indexed_db/dartium/indexed_db_dartium.dart
index c21a6a4ef0a28bfe545a91fe2c19ff669f4f68ca..9071f3833edec52ee3370f0e3af7b90950098419 100644
--- a/sdk/lib/indexed_db/dartium/indexed_db_dartium.dart
+++ b/sdk/lib/indexed_db/dartium/indexed_db_dartium.dart
@@ -441,7 +441,12 @@ class Index extends NativeFieldWrapperClass1 {
     } 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);
   }
 
@@ -463,7 +468,12 @@ class Index extends NativeFieldWrapperClass1 {
     } 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);
   }
 
@@ -502,11 +512,11 @@ class Index extends NativeFieldWrapperClass1 {
 
   @DomName('IDBIndex.openCursor')
   @DocsEditable()
-  Request _openCursor(Object key, String direction) native "IDBIndex_openCursor_Callback";
+  Request _openCursor(Object key, [String direction]) native "IDBIndex_openCursor_Callback";
 
   @DomName('IDBIndex.openKeyCursor')
   @DocsEditable()
-  Request _openKeyCursor(Object key, String direction) native "IDBIndex_openKeyCursor_Callback";
+  Request _openKeyCursor(Object key, [String direction]) native "IDBIndex_openKeyCursor_Callback";
 
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file