Search engine bustage fix b=304309 r=KaiRo

suite/browser/navigator.css

@@ -28,7 +28,7 @@ tabbrowser {
   -moz-binding: url("chrome://navigator/content/urlbarBindings.xml#urlbar");
 }
 
-.autocomplete-result-popup[for="urlbar"] {
+panel[for="urlbar"] {
   -moz-binding: url("chrome://navigator/content/urlbarBindings.xml#autocomplete-result-popup") !important;
 }
 

themes/modern/navigator/navigator.css

@@ -465,7 +465,7 @@ toolbox {
   background-color: #DDE3EB;
 }
 
-.autocomplete-result-popup[nomatch="true"] > .autocomplete-search-box {
+panel[nomatch="true"] > .autocomplete-search-box {
   border-top: 1px solid #E4EAEF;
 }