public com.google.protobuf.DescriptorProtos.DescriptorProto.ExtensionRangeOrBuilder getExtensionRangeOrBuilder(
          int index) {
        if (extensionRangeBuilder_ == null) {
          return extensionRange_.get(index);  } else {
          return extensionRangeBuilder_.getMessageOrBuilder(index);
        }
      }