Bug 415543 - use native application icon. r=gavin

browser/themes/gnomestripe/browser/feeds/subscribe.css

@@ -87,7 +87,7 @@ html {
 }
 
 #chooseApplicationMenuItem {
-  list-style-image: url("chrome://browser/skin/preferences/application.png");
+  list-style-image: url("moz-icon://dummy.exe?size=16");
 }
 
 #feedHeader[dir="rtl"] #handlersMenuList > menupopup {