add style for 'new-child' class, which hides the "new" tag when the parent

list item is expanded (for use when the parent is advertising a new child doc)

Change-Id: I81945c109d1edc3b588a8b1c5968179266a1dc48

tools/droiddoc/templates-sdk/assets/android-developer-docs.css

@@ -791,7 +791,8 @@ ul.no-style {
   padding-left:1em;
 }
 
-.new {
+.new,
+.new-child {
   font-size: .78em;
   font-weight: bold;
   color: #ff3d3d;
@@ -800,6 +801,10 @@ ul.no-style {
   line-height:.9em;
 }
 
+.toggle-list.open .new-child {
+  display:none;
+}
+
 pre.classic {
   background-color:transparent;
   border:none;