Remove unneeded use of Rc in typeck::check::method.

Author: quantheory

src/librustc_typeck/check/method/mod.rs

@@ -22,7 +22,6 @@ use middle::ty::{self, AsPredicate, ToPolyTraitRef};
 use middle::infer;
 use util::ppaux::Repr;
 
-use std::rc::Rc;
 use syntax::ast::DefId;
 use syntax::ast;
 use syntax::codemap::Span;