Bug 1207148 - Remove unused UI wait cursor assets

ui/css/treeherder.css

@@ -472,10 +472,6 @@ fieldset[disabled] .btn-resultset:hover {
     border-bottom: 1px dotted lightgrey;
 }
 
-.waiter-small{ background: url("../img/waiter16.png") no-repeat center center; width: 16px; height: 16px; display: inline-block;}
-.waiter-medium{ background: url("../img/waiter32.png") no-repeat center center; width: 32px; height: 32px; display: inline-block;}
-.waiter-large{ background: url("../img/waiter64.png") no-repeat center center; width: 64px; height: 64px; display: inline-block;}
-
 .deleted{ text-decoration: line-through;}
 
 #notification-box {