rustc: move rustc_front to rustc::hir.

src/librustdoc/html/format.rs

@@ -21,7 +21,7 @@ use std::iter::repeat;
 use rustc::middle::cstore::LOCAL_CRATE;
 use rustc::middle::def_id::{CRATE_DEF_INDEX, DefId};
 use syntax::abi::Abi;
-use rustc_front::hir;
+use rustc::hir;
 
 use clean;
 use html::item_type::ItemType;