Mass clean up: don't cast class when not needed.

Bug: none
Test: rebuild
Change-Id: Ie3f58a3d5ae99ade28a33dcac80c18de90d4d5b2

src/com/android/settings/connecteddevice/SavedDeviceGroupController.java

@@ -74,7 +74,7 @@ public class SavedDeviceGroupController extends BasePreferenceController
     @Override
     public void displayPreference(PreferenceScreen screen) {
         if (isAvailable()) {
-            mPreferenceGroup = (PreferenceGroup) screen.findPreference(KEY);
+            mPreferenceGroup = screen.findPreference(KEY);
             mPreferenceGroup.setVisible(false);
 
             final Context context = screen.getContext();