ServiceWorker: Bypass resolving a promise when ExecutionContext is gone

Source/modules/push_messaging/PushRegistration.cpp

Index: Source/modules/push_messaging/PushRegistration.cpp
diff --git a/Source/modules/push_messaging/PushRegistration.cpp b/Source/modules/push_messaging/PushRegistration.cpp
index 711606640848b24c0645526faeded30cf270e336..c5cb4fbc7719cacdffadee4e77789ac1fff46c5f 100644
--- a/Source/modules/push_messaging/PushRegistration.cpp
+++ b/Source/modules/push_messaging/PushRegistration.cpp
@@ -5,8 +5,21 @@
 #include "config.h"
 #include "modules/push_messaging/PushRegistration.h"
 
+#include "wtf/OwnPtr.h"
+
 namespace blink {
 
+PushRegistration* PushRegistration::from(ScriptPromiseResolver*, WebType* registrationRaw)
+{
+    OwnPtr<WebType> registration = adoptPtr(registrationRaw);
+    return new PushRegistration(registration->endpoint, registration->registrationId);
+}
+
+void PushRegistration::dispose(WebType* registrationRaw)
+{
+    delete registrationRaw;
+}
+
 PushRegistration::PushRegistration(const String& pushEndpoint, const String& pushRegistrationId)
     : m_pushEndpoint(pushEndpoint)
     , m_pushRegistrationId(pushRegistrationId)