Bug 482057 (followup) - Remove a line that was accidentally left behind [r=me]

toolkit/content/widgets/findbar.xml

@@ -156,7 +156,6 @@
             event.preventDefault();
             break;
           case KeyEvent.DOM_VK_DOWN:
-            win.scrollByLines(1);
             controller.scrollLine(true);
             event.preventDefault();
             break;