STREAM_UNUSED     159 net/http/http_pipelined_connection_impl.cc       stream_info_map_[pipeline_id].state != STREAM_UNUSED) {
STREAM_UNUSED     551 net/http/http_pipelined_connection_impl.cc       stream_info_map_[pipeline_id].state = STREAM_UNUSED;
STREAM_UNUSED     592 net/http/http_pipelined_connection_impl.cc     case STREAM_UNUSED: