Update dom streams with new signatures.

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

Index: tools/dom/templates/html/impl/impl_IDBFactory.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_IDBFactory.darttemplate b/tools/dom/templates/html/impl/impl_IDBFactory.darttemplate
index e676f0cda9a0391d17e1fe9219c5a12d65becffe..c7028267e1879610d279a51e5bdc0780f551cbb7 100644
--- a/tools/dom/templates/html/impl/impl_IDBFactory.darttemplate
+++ b/tools/dom/templates/html/impl/impl_IDBFactory.darttemplate
@@ -60,9 +60,7 @@ $endif
       request.onSuccess.listen((e) {
         completer.complete(this);
       });
-      request.onError.listen((e) {
-        completer.completeError(e);
-      });
+      request.onError.listen(completer.completeError);
       return completer.future;
     } catch (e, stacktrace) {
       return new Future.error(e, stacktrace);
@@ -109,8 +107,6 @@ Future _completeRequest(Request request) {
   request.onSuccess.listen((e) {
     completer.complete(request.result);
   });
-  request.onError.listen((e) {
-    completer.completeError(e);
-  });
+  request.onError.listen(completer.completeError);
   return completer.future;
 }