Make implicit intent immutable.

Test: make
Fix: 154627439
Change-Id: Ifee830595bb145aede4dad1d9e42a20e54b6be66

packages/SystemUI/src/com/android/systemui/statusbar/notification/InstantAppNotifier.java

@@ -288,7 +288,7 @@ public class InstantAppNotifier extends SystemUI
                                 mContext,
                                 0,
                                 new Intent(Intent.ACTION_VIEW).setData(Uri.parse(helpUrl)),
-                                0,
+                                PendingIntent.FLAG_IMMUTABLE,
                                 null,
                                 user)
                         : null;