Remove deprecated `config.whiny_nils`

railties/CHANGELOG.md

+*   Remove deprecated `config.whiny_nils` option
+
+    *Vipul A M*
+
 *   Rename `commands/plugin_new.rb` to `commands/plugin.rb` and fix references
 
     *Richard Schneeman*

railties/lib/rails/application/configuration.rb

@@ -150,9 +150,6 @@ def session_store(*args)
         end
       end
 
-      def whiny_nils=(*)
-        ActiveSupport::Deprecation.warn "config.whiny_nils option is deprecated and no longer works"
-      end
     end
   end
 end