message: Update the namespaces of TF-TFRT integration. All TF-TFRT integration code should under namespace tfrt::tf.
diff: @@ -724,7 +724,7 @@ void TFE_DeleteContextOptions(TFE_ContextOptions* options) { delete options; }
  TFE_Context* TFE_NewContext(const TFE_ContextOptions* opts, TF_Status* status) {
  if (opts->use_tfrt) {
  #ifdef PLATFORM_GOOGLE
  - return tensorflow::wrap(new tfrt::ContextInterface(opts->async));
  + return tensorflow::wrap(new tfrt::tf::ContextInterface(opts->async));
  #else
  status->status = tensorflow::errors::Unimplemented("TFRT is not supported");
  return nullptr;
  