Remove script to break out of iframes

lms/templates/main.html

@@ -38,15 +38,6 @@
       </title>
   </%block>
 
-  <script type="text/javascript">
-    /* immediately break out of an iframe if coming from the marketing website */
-    (function(window) {
-      if (window.location !== window.top.location) {
-        window.top.location = window.location;
-      }
-    })(this);
-  </script>
-
   <script type="text/javascript" src="/jsi18n/"></script>
 
   <link rel="icon" type="image/x-icon" href="${static.url(microsite.get_value('favicon_path', settings.FAVICON_PATH))}" />