Fix broken build.

Was broken by d017db0c6b.

Change-Id: Ib1fcb5a8bc7aad6b3fcc501d57f19c931912af75

packages/DocumentsUI/src/com/android/documentsui/DirectoryFragment.java

@@ -575,7 +575,7 @@ public class DirectoryFragment extends Fragment {
         mRecView.setLayoutManager(layout);
         // TODO: Once b/23691541 is resolved, use a listener within MultiSelectManager instead of
         // imperatively calling this function.
-        mSelectionManager.handleLayoutChanged();
+        mModel.mSelectionManager.handleLayoutChanged();
         // setting layout manager automatically invalidates existing ViewHolders.
         mThumbSize = new Point(thumbSize, thumbSize);
     }