Ensure npapi plugin is loaded before clicking on it

content/test/data/npapi/execute_script_delete_in_mouse_up.html

Index: content/test/data/npapi/execute_script_delete_in_mouse_up.html
diff --git a/content/test/data/npapi/execute_script_delete_in_mouse_up.html b/content/test/data/npapi/execute_script_delete_in_mouse_up.html
index f23c08806af917819745d09f59ff9f9086f2a84b..6a21e6636f58c5b373e00e4f74eaa45b4b1e5682 100644
--- a/content/test/data/npapi/execute_script_delete_in_mouse_up.html
+++ b/content/test/data/npapi/execute_script_delete_in_mouse_up.html
@@ -35,6 +35,9 @@ of a synchronous mouse event.
 </DIV>
 <script> 
     var height = document.body.offsetHeight;
+    // Force plugin to be loaded so that we can click on it.
+    var embed = document.getElementById('1');
+    embed.dummy = true;
 </script>
 
 </body>