Revert of Remove content::NotificationPermissionDispatcher.

third_party/WebKit/Source/web/NotificationPermissionClientImpl.h

+// 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 NotificationPermissionClientImpl_h
+#define NotificationPermissionClientImpl_h
+
+#include "modules/notifications/NotificationPermissionClient.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class NotificationPermissionClientImpl : public GarbageCollectedFinalized<NotificationPermissionClientImpl>, public NotificationPermissionClient {
+    USING_GARBAGE_COLLECTED_MIXIN(NotificationPermissionClientImpl);
+public:
+    static NotificationPermissionClientImpl* create();
+
+    ~NotificationPermissionClientImpl() override;
+
+    // NotificationPermissionClient implementation.
+    ScriptPromise requestPermission(ScriptState*, NotificationPermissionCallback*) override;
+
+    // GarbageCollectedFinalized implementation.
+    DEFINE_INLINE_VIRTUAL_TRACE() { NotificationPermissionClient::trace(visitor); }
+
+private:
+    NotificationPermissionClientImpl();
+};
+
+} // namespace blink
+
+#endif // NotificationPermissionClientImpl_h