Remove unused typedef

Author: Owen

src/cpp/expr2cpp.cpp

@@ -43,8 +43,6 @@ class expr2cppt:public expr2ct
     const typet &src,
     const qualifierst &qualifiers,
     const std::string &declarator) override;
-
-  typedef std::unordered_set<std::string, string_hash> id_sett;
 };
 
 std::string expr2cppt::convert_struct(