Remove unused ToHex/FromHex trait

Author: sinkuu

src/librustc_data_structures/lib.rs

@@ -29,8 +29,6 @@ extern crate log;
 #[macro_use]
 extern crate cfg_if;
 
-pub use rustc_serialize::hex::ToHex;
-
 #[inline(never)]
 #[cold]
 pub fn cold_path<F: FnOnce() -> R, R>(f: F) -> R {

src/libserialize/hex.rs

@@ -25,7 +25,6 @@ pub use self::serialize::{UseSpecializedDecodable, UseSpecializedEncodable};
 mod collection_impls;
 mod serialize;
 
-pub mod hex;
 pub mod json;
 
 pub mod leb128;