Remove the Version check as it's not always available.

activesupport/lib/active_support/core_ext/rexml.rb

@@ -5,30 +5,28 @@
 # http://www.ruby-lang.org/en/news/2008/08/23/dos-vulnerability-in-rexml/
 # This fix is identical to rexml-expansion-fix version 1.0.1
 
-unless REXML::VERSION > "3.1.7.2"
-  module REXML
-    class Entity < Child
-      undef_method :unnormalized
-      def unnormalized
-        document.record_entity_expansion! if document
-        v = value()
-        return nil if v.nil?
-        @unnormalized = Text::unnormalize(v, parent)
-        @unnormalized
-      end
+module REXML
+  class Entity < Child
+    undef_method :unnormalized
+    def unnormalized
+      document.record_entity_expansion! if document
+      v = value()
+      return nil if v.nil?
+      @unnormalized = Text::unnormalize(v, parent)
+      @unnormalized
+    end
+  end
+  class Document < Element
+    @@entity_expansion_limit = 10_000
+    def self.entity_expansion_limit= val
+      @@entity_expansion_limit = val
     end
-    class Document < Element
-      @@entity_expansion_limit = 10_000
-      def self.entity_expansion_limit= val
-        @@entity_expansion_limit = val
-      end
 
-      def record_entity_expansion!
-        @number_of_expansions ||= 0
-        @number_of_expansions += 1
-        if @number_of_expansions > @@entity_expansion_limit
-          raise "Number of entity expansions exceeded, processing aborted."
-        end
+    def record_entity_expansion!
+      @number_of_expansions ||= 0
+      @number_of_expansions += 1
+      if @number_of_expansions > @@entity_expansion_limit
+        raise "Number of entity expansions exceeded, processing aborted."
       end
     end
   end