Fix disableForegroundNdefPush crash.

It crashed due to the fact that we're committing a fragment change
after onSaveInstanceState() is called. Instead, commit without
storing the state - as the NfcFragment is something that needs
to be setup explicitly anyway, it is not something the user
expects to be restored.

Bug: 5540962
Change-Id: I5a8cd0e47306f2bbc14b592a0182083bb79cb21a

Author: Martijn Coenen

core/java/android/nfc/NfcFragment.java

@@ -48,7 +48,10 @@ public static void remove(Activity activity) {
         FragmentManager manager = activity.getFragmentManager();
         Fragment fragment = manager.findFragmentByTag(FRAGMENT_TAG);
         if (fragment != null) {
-            manager.beginTransaction().remove(fragment).commit();
+            // We allow state loss at this point, because the state is only
+            // lost when activity is being paused *AND* subsequently destroyed.
+            // In that case, the app will setup foreground dispatch again anyway.
+            manager.beginTransaction().remove(fragment).commitAllowingStateLoss();
         }
     }