message: warning on protobuf
diff: @@ -1007,7 +1007,7 @@ class TableArena {
  }
  for (int i = kSmallSizes.size(); --i >= 0;) {
  - if (to_relocate->space_left() >= 1 + kSmallSizes[i]) {
  + if ((int) to_relocate->space_left() >= 1 + kSmallSizes[i]) {
  to_relocate->PrependTo(small_size_blocks_[i]);
  return;
  }
  