Oilpan: Enable oilpan for callback classes

Source/modules/notifications/NotificationPermissionClient.h

Index: Source/modules/notifications/NotificationPermissionClient.h
diff --git a/Source/modules/notifications/NotificationPermissionClient.h b/Source/modules/notifications/NotificationPermissionClient.h
index 29f565015a8aeeb9aeb5c762422407ebf39664df..30d00200e24f224c422994261a8f1c5e62604a78 100644
--- a/Source/modules/notifications/NotificationPermissionClient.h
+++ b/Source/modules/notifications/NotificationPermissionClient.h
@@ -21,7 +21,7 @@ public:
     // Requests user permission to show platform notifications from the origin
     // of the current frame. The provided callback will be ran when the user
     // has made a decision.
-    virtual void requestPermission(ExecutionContext*, PassOwnPtrWillBeRawPtr<NotificationPermissionCallback>) = 0;
+    virtual void requestPermission(ExecutionContext*, NotificationPermissionCallback*) = 0;
 
     // WillBeHeapSupplement requirements.
     static const char* supplementName();