message: [gRPC] Remove leftover debugging code.
diff: @@ -114,8 +114,6 @@ class RPCState : public GrpcClientCQTag {
  if (s.ok() && failure_.load()) {
  s.Update(errors::Internal("callback error"));
  }
  - string str;
  - GrpcMaybeParseProto(response_buf_, &str);
  if (s.ok() && !GrpcMaybeParseProto(response_buf_, response_)) {
  s.Update(errors::Internal("could not parse rpc response"));
  }
  