Stub implementation for PushRegistration.unregister().

Source/modules/push_messaging/PushRegistrationCallbacks.h

Index: Source/modules/push_messaging/PushRegistrationCallbacks.h
diff --git a/Source/modules/push_messaging/PushRegistrationCallbacks.h b/Source/modules/push_messaging/PushRegistrationCallbacks.h
new file mode 100644
index 0000000000000000000000000000000000000000..cdf4c90adbda1dd5c63bd080bda992acf4d1d8c2
--- /dev/null
+++ b/Source/modules/push_messaging/PushRegistrationCallbacks.h
@@ -0,0 +1,41 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef PushRegistrationCallbacks_h
+#define PushRegistrationCallbacks_h
+
+#include "platform/heap/Handle.h"
+#include "public/platform/WebCallbacks.h"
+#include "wtf/Noncopyable.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefPtr.h"
+
+namespace blink {
+
+class ServiceWorkerRegistration;
+class ScriptPromiseResolver;
+struct WebPushError;
+struct WebPushRegistration;
+
+// PushRegistrationCallbacks is an implementation of WebPushRegistrationCallbacks
+// that will resolve the underlying promise depending on the result passed to
+// the callback. It takes a ServiceWorkerRegistration in its constructor and
+// will pass it to the PushRegistration.
+class PushRegistrationCallbacks final : public WebCallbacks<WebPushRegistration, WebPushError> {
+    WTF_MAKE_NONCOPYABLE(PushRegistrationCallbacks);
+public:
+    PushRegistrationCallbacks(PassRefPtr<ScriptPromiseResolver>, ServiceWorkerRegistration*);
+    ~PushRegistrationCallbacks() override;
+
+    void onSuccess(WebPushRegistration*) override;
+    void onError(WebPushError*) override;
+
+private:
+    RefPtr<ScriptPromiseResolver> m_resolver;
+    Persistent<ServiceWorkerRegistration> m_serviceWorkerRegistration;
+};
+
+} // namespace blink
+
+#endif // PushRegistrationCallbacks_h