MOBILE-921 quiz: Remove duplicate closest function from rebase

Author: dpalou

www/core/lib/util.js

@@ -1216,48 +1216,6 @@ angular.module('mm.core')
             return urls;
         };
 
-        /**
-         * Equivalent to element.closest(). If the browser doesn't support element.closest, it will
-         * traverse the parents to achieve the same functionality.
-         * Returns the closest ancestor of the current element (or the current element itself) which matches the selector.
-         *
-         * @module mm.core
-         * @ngdoc method
-         * @name $mmUtil#closest
-         * @param  {Object} element  DOM Element.
-         * @param  {String} selector Selector to search.
-         * @return {Object}          Closest ancestor.
-         */
-        self.closest = function(element, selector) {
-            // Try to use closest if the browser supports it.
-            if (typeof element.closest == 'function') {
-                return element.closest(selector);
-            }
-
-            if (!matchesFn) {
-                // Find the matches function supported by the browser.
-                ['matches','webkitMatchesSelector','mozMatchesSelector','msMatchesSelector','oMatchesSelector'].some(function(fn) {
-                    if (typeof document.body[fn] == 'function') {
-                        matchesFn = fn;
-                        return true;
-                    }
-                    return false;
-                });
-
-                if (!matchesFn) {
-                    return;
-                }
-            }
-
-            // Traverse parents.
-            while (element) {
-                if (element[matchesFn](selector)) {
-                    return element;
-                }
-                element = element.parentElement;
-            }
-        };
-
         /**
          * Returns the contents of a certain selection in a DOM element.
          *