REXML::DocType: remove needless quote strip

Because parser already strips quotes.

Author: kou

lib/rexml/doctype.rb

@@ -161,7 +161,7 @@ def public
       when "SYSTEM"
         nil
       when "PUBLIC"
-        strip_quotes(@long_name)
+        @long_name
       end
     end
 
@@ -171,9 +171,9 @@ def public
     def system
       case @external_id
       when "SYSTEM"
-        strip_quotes(@long_name)
+        @long_name
       when "PUBLIC"
-        @uri.kind_of?(String) ? strip_quotes(@uri) : nil
+        @uri.kind_of?(String) ? @uri : nil
       end
     end
 
@@ -195,15 +195,6 @@ def notation(name)
         notation_decl.name == name
       }
     end
-
-    private
-
-    # Method contributed by Henrik Martensson
-    def strip_quotes(quoted_string)
-      quoted_string =~ /^[\'\"].*[\'\"]$/ ?
-        quoted_string[1, quoted_string.length-2] :
-        quoted_string
-    end
   end
 
   # We don't really handle any of these since we're not a validating