Revert "Remove the generics from _FrozenElementList: causes checked mode failures"

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

Index: tools/dom/templates/html/impl/impl_IDBObjectStore.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_IDBObjectStore.darttemplate b/tools/dom/templates/html/impl/impl_IDBObjectStore.darttemplate
index 1363056fb541de952d3f34c08dda634760515524..9e0bae3ad74ca35bc319650dab600afbbcc74b79 100644
--- a/tools/dom/templates/html/impl/impl_IDBObjectStore.darttemplate
+++ b/tools/dom/templates/html/impl/impl_IDBObjectStore.darttemplate
@@ -142,7 +142,7 @@ $!MEMBERS
     // TODO: need to guarantee that the controller provides the values
     // immediately as waiting until the next tick will cause the transaction to
     // close.
-    var controller = new StreamController(sync: true);
+    var controller = new StreamController<Cursor>(sync: true);
 
     //TODO: Report stacktrace once issue 4061 is resolved.
     request.onError.listen(controller.addError);