clearChoices when setting AbsListView adapters.

This allows us to reset mCheckedItemCount to 0 to match the clearing
of check states.

Bug: 63559021
Fixes: 63559021
Test: Added test to AbsListViewTest.

Change-Id: I47a0fbc25448addf75a3f7e5a282bb98360200dd

core/java/android/widget/AbsListView.java

@@ -913,14 +913,7 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
                 mCheckedIdStates = new LongSparseArray<Integer>();
             }
         }
-
-        if (mCheckStates != null) {
-            mCheckStates.clear();
-        }
-
-        if (mCheckedIdStates != null) {
-            mCheckedIdStates.clear();
-        }
+        clearChoices();
     }
 
     /**