Use event init dictionaries in modules/{notifications,push_messaging,serviceworkers}

Source/modules/notifications/NotificationEvent.cpp

Index: Source/modules/notifications/NotificationEvent.cpp
diff --git a/Source/modules/notifications/NotificationEvent.cpp b/Source/modules/notifications/NotificationEvent.cpp
index 4c1e158f5f2091162f661115de6d6fbe2eacdf14..2f8046ebd0965a9d6167a402704f929bb47f97b8 100644
--- a/Source/modules/notifications/NotificationEvent.cpp
+++ b/Source/modules/notifications/NotificationEvent.cpp
@@ -7,24 +7,22 @@
 
 namespace blink {
 
-NotificationEventInit::NotificationEventInit()
-{
-}
-
 NotificationEvent::NotificationEvent()
 {
 }
 
 NotificationEvent::NotificationEvent(const AtomicString& type, const NotificationEventInit& initializer)
     : ExtendableEvent(type, initializer)
-    , m_notification(initializer.notification)
 {
+    if (initializer.hasNotification())
+        m_notification = initializer.notification();
 }
 
 NotificationEvent::NotificationEvent(const AtomicString& type, const NotificationEventInit& initializer, WaitUntilObserver* observer)
     : ExtendableEvent(type, initializer, observer)
-    , m_notification(initializer.notification)
 {
+    if (initializer.hasNotification())
+        m_notification = initializer.notification();
 }
 
 NotificationEvent::~NotificationEvent()