replace function call with trim

src/re2parser.cc

@@ -252,7 +252,7 @@ namespace {
                     }
                 }
             }
-            RegexParser::renumber_states(output_nfa, explicit_nfa);
+            *output_nfa = Nfa(explicit_nfa).trim();
         }
 
     private: // private methods
@@ -440,16 +440,6 @@ namespace {
             }
         }
 
-        /**
-         * Renumbers the states of the input_nfa to be from <0, numberOfStates>
-         * @param input_nfa Nfa which states should be renumbered
-         * @return Equivalent Nfa as input_nfa but trimmed and with states from interval <0, numberOfStates>
-         */
-        static Nfa renumber_states(Nfa* output_nfa, Nfa &input_nfa) {
-            *output_nfa = Nfa(input_nfa.delta, input_nfa.initial, input_nfa.final).trim();
-            return *output_nfa;
-        }
-
         /**
          * Gets all states that are mapped to the state (i.e., states that are within epsilon transitions chain)
          * @param prog RE2 prog corresponding to the parsed regex