Fragmentize "Factory reset" setting screen.

Split the screen into 2 fragments.

Bug: 3148480

src/com/android/settings/PrivacySettings.java

@@ -98,7 +98,7 @@ public class PrivacySettings extends SettingsPreferenceFragment implements
             }
         }
 
-        return false;
+        return super.onPreferenceTreeClick(preferenceScreen, preference);
     }
 
     private void showEraseBackupDialog() {