Remove unused variable.
Remove unused variable.

ruby-protobuf/protobuf,film42/protobuf,localshred/protobuf,brianstien/protobuf,brianstien/protobuf,quixoten/protobuf,localshred/protobuf,ruby-protobuf/protobuf,quixoten/protobuf,zanker/protobuf,lookout/protobuffy,film42/protobuf,lookout/protobuffy,zanker/protobuf