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

Bug: none
Test: rebuild
Change-Id: Ie3f58a3d5ae99ade28a33dcac80c18de90d4d5b2

src/com/android/settings/network/AirplaneModePreferenceController.java

@@ -81,7 +81,7 @@ public class AirplaneModePreferenceController extends TogglePreferenceController
     public void displayPreference(PreferenceScreen screen) {
         super.displayPreference(screen);
         if (isAvailable()) {
-            mAirplaneModePreference = (SwitchPreference) screen.findPreference(getPreferenceKey());
+            mAirplaneModePreference = screen.findPreference(getPreferenceKey());
         }
     }