Revert of Remove support for legacy WebKit Notifications

Source/web/WebNotification.cpp

Index: Source/web/WebNotification.cpp
diff --git a/Source/web/WebNotification.cpp b/Source/web/WebNotification.cpp
index caec7f36a37bed63ff9dc92507d3c3955ce531d1..1e70be919487e7f78a4b3be44bc563e8165646e7 100644
--- a/Source/web/WebNotification.cpp
+++ b/Source/web/WebNotification.cpp
@@ -34,7 +34,7 @@
 #include "WebTextDirection.h"
 #include "core/events/Event.h"
 #include "core/page/WindowFocusAllowedIndicator.h"
-#include "modules/notifications/Notification.h"
+#include "modules/notifications/NotificationBase.h"
 #include "platform/UserGestureIndicator.h"
 #include "public/platform/WebString.h"
 #include "public/platform/WebURL.h"
@@ -44,7 +44,7 @@
 
 namespace blink {
 
-class WebNotificationPrivate : public Notification {
+class WebNotificationPrivate : public NotificationBase {
 };
 
 void WebNotification::reset()
@@ -124,20 +124,20 @@
     m_private->dispatchClickEvent();
 }
 
-WebNotification::WebNotification(const WTF::PassRefPtr<Notification>& notification)
+WebNotification::WebNotification(const WTF::PassRefPtr<NotificationBase>& notification)
     : m_private(static_cast<WebNotificationPrivate*>(notification.leakRef()))
 {
 }
 
-WebNotification& WebNotification::operator=(const WTF::PassRefPtr<Notification>& notification)
+WebNotification& WebNotification::operator=(const WTF::PassRefPtr<NotificationBase>& notification)
 {
     assign(static_cast<WebNotificationPrivate*>(notification.leakRef()));
     return *this;
 }
 
-WebNotification::operator WTF::PassRefPtr<Notification>() const
+WebNotification::operator WTF::PassRefPtr<NotificationBase>() const
 {
-    return WTF::PassRefPtr<Notification>(const_cast<WebNotificationPrivate*>(m_private));
+    return WTF::PassRefPtr<NotificationBase>(const_cast<WebNotificationPrivate*>(m_private));
 }
 
 void WebNotification::assign(WebNotificationPrivate* p)