Removed Chrome Frame stuff

I originally accepted a pullreq that added this check but since then Chrome Frame support has been discontinued and people have told me that FileSaver.js doesn't work in Chrome Frame, so this has no place here.

FileSaver.js

@@ -31,7 +31,7 @@ var saveAs = saveAs
 			return view.URL || view.webkitURL || view;
 		}
 		, save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a")
-		, can_use_save_link = !view.externalHost && "download" in save_link
+		, can_use_save_link = "download" in save_link
 		, click = function(node) {
 			var event = doc.createEvent("MouseEvents");
 			event.initMouseEvent(