Remove AA+ decorator logic from aosp code

Bug: 179495850
Test: manual

Change-Id: I7e029e4970f45a0f7c410533f85335a95e4e448c

src/com/android/launcher3/allapps/AllAppsContainerView.java

@@ -699,8 +699,7 @@ public class AllAppsContainerView extends SpringRelativeLayout implements DragSo
             applyPadding();
             setupOverlay();
             if (FeatureFlags.ENABLE_DEVICE_SEARCH.get()) {
-                recyclerView.addItemDecoration(new AllAppsSectionDecorator(
-                        AllAppsContainerView.this));
+                recyclerView.addItemDecoration(mSearchAdapterProvider.getDecorator());
             }
         }