Don't show icon for power-off confirmation dialog.

Bug: 5380396
Change-Id: I57574b613d95885c829df729297b24be1c73b876

Author: Amith Yamasani

core/java/com/android/internal/app/ShutdownThread.java

@@ -109,7 +109,6 @@ public static void shutdown(final Context context, boolean confirm) {
         if (confirm) {
             final CloseDialogReceiver closer = new CloseDialogReceiver(context);
             final AlertDialog dialog = new AlertDialog.Builder(context)
-                    .setIconAttribute(android.R.attr.alertDialogIcon)
                     .setTitle(com.android.internal.R.string.power_off)
                     .setMessage(resourceId)
                     .setPositiveButton(com.android.internal.R.string.yes, new DialogInterface.OnClickListener() {