drop obsolete function, re #160

exercises/algebraq/question.php

@@ -331,23 +331,6 @@ class qtype_algebra_question {
         // Use the parser's equivalent method to see if the response is the same as the answer.
         return $response->equivalent($answer);
     }
-
-    public function check_file_access($qa, $options, $component, $filearea,
-            $args, $forcedownload) {
-        if ($component == 'question' && $filearea == 'answerfeedback') {
-            $currentanswer = $qa->get_last_qt_var('answer');
-            $answer = $this->get_matching_answer(['answer' => $currentanswer]);
-            $answerid = reset($args); // Parameter itemid is answer id.
-            return $options->feedback && $answerid == $answer->id;
-
-        } else if ($component == 'question' && $filearea == 'hint') {
-            return $this->check_hint_file_access($qa, $options, $args);
-
-        } else {
-            return parent::check_file_access($qa, $options, $component, $filearea,
-                    $args, $forcedownload);
-        }
-    }
 }
 
 /**