Bugs 36789, 22861, and 38827 (all related to downloading files); change xfer component to use nsIFilePicker, handle content-disposition: http response header, and fix a l10n problem; r=slamm

suite/browser/navigator.js

@@ -80,7 +80,7 @@ function savePage( url )
     // When Necko lands, we need to receive the real nsIChannel and
     // do SelectFileAndTransferLocation!
     // Use this for now...
-    xfer.SelectFileAndTransferLocationSpec( url, window );
+    xfer.SelectFileAndTransferLocationSpec( url, window, "", "" );
   } 
   catch( exception ) { 
     // suppress NS_ERROR_ABORT exceptions for cancellation