message: Don't Ref() XlaDeviceContext unnecessarily.
diff: @@ -234,7 +234,6 @@ Status XlaDevice::CreateAndSetGpuDeviceInfo() {
  gpu_device_info_->stream = stream;
  gpu_device_info_->default_context =
  new XlaDeviceContext(stream, client(), transfer_as_literal_);
  - gpu_device_info_->default_context->Ref();
  set_tensorflow_gpu_device_info(gpu_device_info_.get());
  }
  