message: Changed return type of ByteCount() to int64_t for convergence between internal/external protobuf.
diff: @@ -468,7 +468,9 @@ class FileStream : public ::tensorflow::protobuf::io::ZeroCopyInputStream {
  pos_ += count;
  return true;
  }
  - protobuf_int64 ByteCount() const override { return pos_; }
  + int64_t ByteCount() const override {
  + return pos_;
  + }
  Status status() const { return status_; }
  bool Next(const void** data, int* size) override {
  