Refactor allapps.search package to depend on ActivityContext.

Test: Manual
Bug: 216683257
Change-Id: I6230498b24380b37531f8a83db1dc768270e708a

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

@@ -103,11 +103,6 @@ public class ActivityAllAppsContainerView<T extends BaseDraggingActivity> extend
         }
     }
 
-    /** Handles selection on focused view and returns {@code true} on success. */
-    public boolean launchHighlightedItem() {
-        return getMainAdapterProvider().launchHighlightedItem();
-    }
-
     @Override
     protected SearchAdapterProvider<?> createMainAdapterProvider() {
         return mActivityContext.createSearchAdapterProvider(this);