AC::Caching DRYup

Remove ActionController::Caching::Pages#caching_allowed
because it duplicates ActionController::Caching#caching_allowed?

Signed-off-by: Santiago Pastorino <santiago@wyeworks.com>

actionpack/lib/action_controller/caching/pages.rb

@@ -134,7 +134,7 @@ def expire_page(options = {})
       # If no options are provided, the requested url is used. Example:
       #   cache_page "I'm the cached content", :controller => "lists", :action => "show"
       def cache_page(content = nil, options = nil)
-        return unless self.class.perform_caching && caching_allowed
+        return unless self.class.perform_caching && caching_allowed?
 
         path = case options
           when Hash
@@ -148,10 +148,6 @@ def cache_page(content = nil, options = nil)
         self.class.cache_page(content || response.body, path)
       end
 
-      private
-        def caching_allowed
-          request.get? && response.status.to_i == 200
-        end
     end
   end
 end