MDL-51190 javascript: Make "maximised embed" compatible with MS Edge

MS Edge exhibits strange behaviour when M.util.init_maximised_embed hides
the embedded document by setting its width and height to 0px.  Toggling
display:none instead achieves the intended goal without breaking Edge.

lib/javascript-static.js

@@ -343,8 +343,7 @@ M.util.init_maximised_embed = function(Y, id) {
     };
 
     var resize_object = function() {
-        obj.setStyle('width', '0px');
-        obj.setStyle('height', '0px');
+        obj.setStyle('display', 'none');
         var newwidth = get_htmlelement_size('maincontent', 'width') - 35;
 
         if (newwidth > 500) {
@@ -360,13 +359,16 @@ M.util.init_maximised_embed = function(Y, id) {
             newheight = 400;
         }
         obj.setStyle('height', newheight+'px');
+        obj.setStyle('display', '');
     };
 
     resize_object();
     // fix layout if window resized too
-    window.onresize = function() {
-        resize_object();
-    };
+    Y.use('event-resize', function (Y) {
+        Y.on("windowresize", function() {
+            resize_object();
+        });
+    });
 };
 
 /**