Fixes #6115: scope breadcrumb styles to immediate children only

less/breadcrumbs.less

@@ -9,16 +9,16 @@
   list-style: none;
   background-color: #f5f5f5;
   .border-radius(@baseBorderRadius);
-  li {
+  > li {
     display: inline-block;
     .ie7-inline-block();
     text-shadow: 0 1px 0 @white;
   }
-  .divider {
+  > .divider {
     padding: 0 5px;
     color: #ccc;
   }
-  .active {
+  > .active {
     color: @grayLight;
   }
 }