MDL-21503 eliminating global Y

lib/javascript-static.js

@@ -158,7 +158,8 @@ M.util.CollapsibleRegion.prototype.icon = null;
 //=== old legacy JS code, hopefully to be replaced soon by M.xx.yy and YUI3 code ===
 
 function launch_filemanager(options) {
-    Y.use('core_filemanager', function() {
+	// TODO: move to M.form_filemanager.init()
+    YUI(M.yui.loader).use('core_filemanager', function(Y) {
         var client_id = options.client_id;
         // filemangers defined in lib/form/filemanager.js
         if (!filemanagers[client_id]) {
@@ -1213,14 +1214,6 @@ function stripHTML(str) {
     return ret;
 }
 
-function json_decode(json) {
-    return Y.JSON.parse(json);
-}
-
-function json_encode(data) {
-    return Y.JSON.stringify(data);
-}
-
 /**
  * Finds all help icons on the page and initiates YUI tooltips for
  * each of them, which load a truncated version of the help's content