SyncManager: Mark unaudited PendingIntents with FLAG_MUTABLE_UNAUDITED

These PIs need an explicit mutability flag. This temporay flag is being
used to mark these points in code and should be replaced ASAP.
See go/immutable-pendingintents for more context.

Bug: 160794467
Test: TH
Exempt-From-Owner-Approval: noop change
Change-Id: I3e2759285cf544c25a4f461f6cbdf62bc3f80932

services/core/java/com/android/server/content/SyncManager.java

@@ -3838,9 +3838,12 @@ public class SyncManager {
             }
 
             UserHandle user = new UserHandle(userId);
+            // TODO(b/174186839) Please replace FLAG_MUTABLE_UNAUDITED below
+            // with either FLAG_IMMUTABLE (recommended) or FLAG_MUTABLE.
             final PendingIntent pendingIntent = PendingIntent
                     .getActivityAsUser(mContext, 0, clickIntent,
-                            PendingIntent.FLAG_CANCEL_CURRENT, null, user);
+                            PendingIntent.FLAG_CANCEL_CURRENT
+                            | PendingIntent.FLAG_MUTABLE_UNAUDITED, null, user);
 
             CharSequence tooManyDeletesDescFormat = mContext.getResources().getText(
                     R.string.contentServiceTooManyDeletesNotificationDesc);