rustc: move rustc_front to rustc::hir.

src/librustdoc/html/render.rs

@@ -60,7 +60,7 @@ use rustc::middle::def_id::{CRATE_DEF_INDEX, DefId};
 use rustc::middle::privacy::AccessLevels;
 use rustc::middle::stability;
 use rustc::session::config::get_unstable_features_setting;
-use rustc_front::hir;
+use rustc::hir;
 
 use clean::{self, SelfTy, Attributes, GetDefId};
 use doctree;