Move Array#sort_by! to http/cookie/ruby_compat.

lib/http/cookie/ruby_compat.rb

@@ -10,6 +10,10 @@ class Array
     self[i..-1] = []
     self
   end unless method_defined?(:select!)
+
+  def sort_by!(&block)
+    replace(sort_by(&block))
+  end unless method_defined?(:sort_by!)
 end
 
 class Hash

lib/http/cookie_jar/hash_store.rb

@@ -1,13 +1,5 @@
 require 'http/cookie_jar'
 
-# :stopdoc:
-class Array
-  def sort_by!(&block)
-    replace(sort_by(&block))
-  end unless method_defined?(:sort_by!)
-end
-# :startdoc:
-
 class HTTP::CookieJar
   # A store class that uses a hash-based cookie store.
   #