message: Fix AttachSeparatorsToListElementPartitions()
diff: @@ -1377,9 +1377,9 @@ static void AttachSeparatorToPreviousOrNextPartition(
  void AttachSeparatorsToListElementPartitions(TokenPartitionTree* partition) {
  CHECK_NOTNULL(partition);
  // Skip first and last partition, as those can't contain just a separator.
  - int size = partition->Children().size();
  - for (int i = 1; i < size - 1; ++i) {
  + for (int i = 1; i < static_cast<int>(partition->Children().size()) - 1; ++i) {
  auto& subpartition = partition->Children()[i];
  + // This can change children count
  AttachSeparatorToPreviousOrNextPartition(&subpartition);
  }
  }
  