Remove unused FAST_STATE_PROTOTYPE and PRETTY_STATE_PROTOTYPE

Author: byroot

lib/json/common.rb

@@ -71,8 +71,6 @@ def generator=(generator) # :nodoc:
       self.state = generator::State
       const_set :State, self.state
       const_set :SAFE_STATE_PROTOTYPE, State.new # for JRuby
-      const_set :FAST_STATE_PROTOTYPE, create_fast_state
-      const_set :PRETTY_STATE_PROTOTYPE, create_pretty_state
     ensure
       $VERBOSE = old
     end