clear some warnings

src/proto/stream_recv_close.rs

@@ -1,15 +1,9 @@
 use {ConnectionError};
 use error::Reason;
-use error::User;
 use frame::{self, Frame};
 use proto::*;
 use proto::ready::ReadySink;
 
-use fnv::FnvHasher;
-use futures::*;
-use ordermap::OrderMap;
-use std::hash::BuildHasherDefault;
-
 // TODO track "last stream id" for GOAWAY.
 // TODO track/provide "next" stream id.
 // TODO reset_streams needs to be bounded.