Moving prediction icons back into recycler view.

- Fixes two accessibility issues with the prediction bar being
  separate from the rest of the list of icons related to scrolling
  and switch access.

Bug: 21725276
Change-Id: Ibc48e5028cace9a77000e6646b951f021910465d

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

@@ -72,6 +72,7 @@ public abstract class AllAppsSearchBarController {
      * Returns whether the prediction bar should currently be visible depending on the state of
      * the search bar.
      */
+    @Deprecated
     public abstract boolean shouldShowPredictionBar();
 
     /**