Hiding the icon of notifications that were replied to

Because those notifications now stay around but the user
has already seen them, were hiding the icon instead.

Change-Id: I6b8590e31295ed79218698b1ac54df33b273d38c
Fixes: 78486801
Test: add notification, reply, observe icon gone
diff --git a/core/java/android/app/Notification.java b/core/java/android/app/Notification.java
index 526888d..06261d3 100644
--- a/core/java/android/app/Notification.java
+++ b/core/java/android/app/Notification.java
@@ -7356,7 +7356,14 @@
                 return messages;
             }
 
-            static Message getMessageFromBundle(Bundle bundle) {
+            /**
+             * @return The message that is stored in the bundle or null if the message couldn't be
+             * resolved.
+             *
+             * @hide
+             */
+            @Nullable
+            public static Message getMessageFromBundle(Bundle bundle) {
                 try {
                     if (!bundle.containsKey(KEY_TEXT) || !bundle.containsKey(KEY_TIMESTAMP)) {
                         return null;