merge backout

browser/base/content/content.js

@@ -36,6 +36,8 @@
 #
 # ***** END LICENSE BLOCK *****
 
+const Ci = Components.interfaces;
+
 const webNavigation = docShell.QueryInterface(Ci.nsIWebNavigation);
 
 addMessageListener("WebNavigation:LoadURI", function(message) {