Remove check that can never be true from RNNOp.

Summary: As desc.

Reviewed By: salexspb

Differential Revision: D5971303

fbshipit-source-id: 4728b4df91e16c151efce48f1987f2e5d109f343
diff --git a/caffe2/operators/recurrent_network_op.h b/caffe2/operators/recurrent_network_op.h
index 6fd8866..5f9a389 100644
--- a/caffe2/operators/recurrent_network_op.h
+++ b/caffe2/operators/recurrent_network_op.h
@@ -421,10 +421,6 @@
     const auto stepNet =
         OperatorBase::GetSingleArgument<string>("backward_step_net", "");
 
-    if (stepNetDef_.type() == "rnn") {
-      stepNetDef_.set_type("simple");
-    }
-
     CAFFE_ENFORCE(
         google::protobuf::TextFormat::ParseFromString(stepNet, &stepNetDef_));