[Sass] Get rid of the now-unused OrderedHash.

lib/sass/css.rb

@@ -42,61 +42,6 @@ module Sass
     end
   end
 
-  # This class is based on the Ruby 1.9 ordered hashes.
-  # It keeps the semantics and most of the efficiency of normal hashes
-  # while also keeping track of the order in which elements were set.
-  class OrderedHash
-    Node = Struct.new(:key, :value, :next, :prev)
-    include Enumerable
-
-    def initialize
-      @hash = {}
-    end
-
-    def initialize_copy(other)
-      @hash = other.instance_variable_get('@hash').clone
-    end
-
-    def [](key)
-      @hash[key] && @hash[key].value
-    end
-
-    def []=(key, value)
-      node = Node.new(key, value)
-
-      if old = @hash[key]
-        if old.prev
-          old.prev.next = old.next
-        else # old is @first and @last
-          @first = @last = nil
-        end
-      end
-
-      if @first.nil?
-        @first = @last = node
-      else
-        node.prev = @last
-        @last.next = node
-        @last = node
-      end
-
-      @hash[key] = node
-      value
-    end
-
-    def each
-      return unless @first
-      yield [@first.key, @first.value]
-      node = @first
-      yield [node.key, node.value] while node = node.next
-      self
-    end
-
-    def values
-      self.map { |k, v| v }
-    end
-  end
-
   # :startdoc:
 
   # This class contains the functionality used in the +css2sass+ utility,