Bug 175893. Make XUL tabs focusable. Relanding toolkit part of patch following aviary branch landing - previously reviewed. This part restores the missing tab loading indicators.

toolkit/themes/qute/global/browser.css

@@ -28,7 +28,7 @@ tabpanels {
   -moz-image-region: rect(0px, 16px, 16px, 0px);
 }
 
-tab[busy] > .tab-icon {
+tab[busy] > .tab-middle > .tab-icon {
   list-style-image: url("chrome://global/skin/icons/Loading.gif");
 }
 

toolkit/themes/winstripe/global/browser.css

@@ -32,7 +32,7 @@ tabpanels {
   -moz-image-region: rect(0px, 16px, 16px, 0px);
 }
 
-tab[busy] > .tab-icon {
+tab[busy] > .tab-middle > .tab-icon {
   list-style-image: url("chrome://browser/skin/Throbber-small.gif");
   -moz-opacity: 0.5;
 }