Bug 1302725 - plugin-doorhanger.inc.css references alerticon-info-negative.png...

Bug 1302725 - plugin-doorhanger.inc.css references alerticon-info-negative.png which has been changed to SVG, r=dao.

browser/themes/shared/plugin-doorhanger.inc.css

@@ -18,7 +18,7 @@
 }
 
 .center-item-warning-icon {
-  background-image: url("chrome://mozapps/skin/extensions/alerticon-info-negative.png");
+  background-image: url("chrome://mozapps/skin/extensions/alerticon-info-negative.svg");
   background-repeat: no-repeat;
   width: 16px;
   height: 15px;