Make DelegatingContentLimitingAdapter non final

Test: none
Bug: 159766205
Change-Id: I092cd411f0d2925ff6d727277ac80f8f43eafcef
diff --git a/car-ui-lib/src/com/android/car/ui/recyclerview/DelegatingContentLimitingAdapter.java b/car-ui-lib/src/com/android/car/ui/recyclerview/DelegatingContentLimitingAdapter.java
index 45d0d7a..c865b75 100644
--- a/car-ui-lib/src/com/android/car/ui/recyclerview/DelegatingContentLimitingAdapter.java
+++ b/car-ui-lib/src/com/android/car/ui/recyclerview/DelegatingContentLimitingAdapter.java
@@ -31,7 +31,7 @@
  *
  * @param <T> type of the {@link RecyclerView.ViewHolder} objects used by the delegate.
  */
-public final class DelegatingContentLimitingAdapter<T extends RecyclerView.ViewHolder>
+public class DelegatingContentLimitingAdapter<T extends RecyclerView.ViewHolder>
         extends ContentLimitingAdapter<T> {
     private static final int SCROLLING_LIMITED_MESSAGE_VIEW_TYPE = Integer.MAX_VALUE;
     private static final int SCROLLING_LIMITED_MESSAGE_DEFAULT_POSITION_OFFSET = -1;