MDL-33990 - yui2: remove 2 uncessary requirements

We no longer use yui2 logger and connection in set_user_prefs

lib/ajax/ajaxlib.php

@@ -36,9 +36,6 @@
 function user_preference_allow_ajax_update($name, $paramtype) {
     global $USER, $PAGE;
 
-    // Make sure that the required JavaScript libraries are loaded.
-    $PAGE->requires->yui2_lib('connection');
-
     // Record in the session that this user_preference is allowed to updated remotely.
     $USER->ajax_updatable_user_prefs[$name] = $paramtype;
 }

lib/outputrequirementslib.php

@@ -326,7 +326,6 @@ class page_requirements_manager {
         );
         if (debugging('', DEBUG_DEVELOPER)) {
             $this->M_cfg['developerdebug'] = true;
-            $this->yui2_lib('logger');
         }
 
         // accessibility stuff