[PushMessaging] Use appopriate type parameters for WebCallbacks (1/3).

Source/modules/push_messaging/PushSubscription.cpp

 // 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.
 
 #include "config.h"
 #include "modules/push_messaging/PushSubscription.h"
 
 #include "bindings/core/v8/CallbackPromiseAdapter.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/V8ObjectBuilder.h"
 #include "modules/push_messaging/PushError.h"
 #include "modules/serviceworkers/ServiceWorkerRegistration.h"
 #include "public/platform/Platform.h"
 #include "public/platform/modules/push_messaging/WebPushProvider.h"
 #include "public/platform/modules/push_messaging/WebPushSubscription.h"
 #include "wtf/OwnPtr.h"
 
 namespace blink {
 
-PushSubscription* PushSubscription::take(ScriptPromiseResolver*, WebPushSubscription* pushSubscription, ServiceWorkerRegistration* serviceWorkerRegistration)
+PushSubscription* PushSubscription::take(ScriptPromiseResolver*, PassOwnPtr<WebPushSubscription> pushSubscription, ServiceWorkerRegistration* serviceWorkerRegistration)
 {
-    OwnPtr<WebPushSubscription> subscription = adoptPtr(pushSubscription);
-    return new PushSubscription(*subscription, serviceWorkerRegistration);
+    if (!pushSubscription)
+        return nullptr;
+    return new PushSubscription(*pushSubscription, serviceWorkerRegistration);
 }
 
 void PushSubscription::dispose(WebPushSubscription* pushSubscription)
 {
     if (pushSubscription)
         delete pushSubscription;
 }
 
 PushSubscription::PushSubscription(const WebPushSubscription& subscription, ServiceWorkerRegistration* serviceWorkerRegistration)
     : m_endpoint(subscription.endpoint)
@@ skipping 38 matching lines @@
 
     return result.scriptValue();
 }
 
 DEFINE_TRACE(PushSubscription)
 {
     visitor->trace(m_serviceWorkerRegistration);
 }
 
 } // namespace blink