* ext/psych/lib/psych.rb: removing unused code

* ext/psych/lib/psych/visitors/yaml_tree.rb: removing unused code

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27481 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/psych/lib/psych.rb

@@ -182,7 +182,7 @@ module Psych
   ###
   # Dump Ruby object +o+ to a JSON string.
   def self.to_json o
-    visitor = Psych::Visitors::JSONTree.new(:json => true)
+    visitor = Psych::Visitors::JSONTree.new
     visitor << o
     visitor.tree.to_yaml
   end

ext/psych/lib/psych/visitors/yaml_tree.rb

@@ -5,7 +5,6 @@ module Psych
 
       def initialize options = {}
         super()
-        @json  = options[:json]
         @tree  = Nodes::Stream.new
         @stack = []
         @st    = {}