Remove obsolete function thanks to mimetype library

gadget/gadget_cribjs_page_save_load.js

@@ -5,14 +5,6 @@
            mimeType) {
   "use strict";
 
-  function getExtension(url) {
-    var extension = url.split('.').pop();
-    if (extension.endsWith('/')) {
-      return ".html";
-    }
-    return "." + extension;
-  }
-
   function log(gadget, str, klass) {
     var p = document.createElement('p'),
       old_p_element = gadget.props.element.querySelector(klass + ' p'),

gadget/gadget_landing_cribjs.js

@@ -4,14 +4,6 @@
 (function (window, document, RSVP, rJS, location, console, JSZip, mimeType) {
   "use strict";
 
-  function getExtension(url) {
-    var extension = url.split('.').pop();
-    if (extension.endsWith('/')) {
-      return ".html";
-    }
-    return "." + extension;
-  }
-
   function loadZipIntoCrib(gadget, zip, from_path, path_to_load, logFunction) {
     if (logFunction === undefined) {
       logFunction = console.log;