Merge pull request #8280 from pelly/mediaQuery_array_bugfix

proper loop iteration for javascript array ensures extensions to Array.prototype don't break us

diff --cc js/foundation.util.mediaQuery.js
index 6175b13af963118174d017b8d0593396a354c9f6,60d3e63a9373c4419ba0bd618537b93349015a71..baa1f0b8721c69adca213ed737a0271aae7396cc
--- 1/js/foundation.util.mediaQuery.js
--- 2/js/foundation.util.mediaQuery.js
+++ b/js/foundation.util.mediaQuery.js
@@@ -81,10 -81,10 +81,10 @@@ var MediaQuery = 
     * @private
     * @returns {String} Name of the current breakpoint.
     */
 -  _getCurrentSize: function() {
 +  _getCurrentSize() {
      var matched;
  
-     for (var i in this.queries) {
+     for (var i = 0; i < this.queries.length; i++) {
        var query = this.queries[i];
  
        if (window.matchMedia(query.value).matches) {