Only allow action buttons in persistent notifications per spec update

third_party/WebKit/Source/modules/notifications/Notification.cpp

Index: third_party/WebKit/Source/modules/notifications/Notification.cpp
diff --git a/third_party/WebKit/Source/modules/notifications/Notification.cpp b/third_party/WebKit/Source/modules/notifications/Notification.cpp
index e9a6ef8496814f79e63538f984efc90757cbafcb..17d20e60e9d9f4887f6e1f41fe2dc45f70c341ef 100644
--- a/third_party/WebKit/Source/modules/notifications/Notification.cpp
+++ b/third_party/WebKit/Source/modules/notifications/Notification.cpp
@@ -79,6 +79,11 @@ Notification* Notification::create(ExecutionContext* context, const String& titl
         return nullptr;
     }
 
+    if (!options.actions().isEmpty()) {
+        exceptionState.throwTypeError("Actions are only supported for persistent notifications shown using ServiceWorkerRegistration.showNotification().");
+        return nullptr;
+    }
+
     String insecureOriginMessage;
     UseCounter::Feature feature = context->isSecureContext(insecureOriginMessage)
         ? UseCounter::NotificationSecureOrigin