[PushMessaging] Use appopriate type parameters for WebCallbacks (2/3).

content/renderer/push_messaging/push_messaging_dispatcher.cc

 // 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 "content/renderer/push_messaging/push_messaging_dispatcher.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "content/child/service_worker/web_service_worker_registration_impl.h"
 #include "content/common/push_messaging_messages.h"
 #include "content/renderer/manifest/manifest_manager.h"
@@ skipping 72 matching lines @@
 }
 
 void PushMessagingDispatcher::OnSubscribeFromDocumentSuccess(
     int32_t request_id,
     const GURL& endpoint,
     const std::vector<uint8_t>& curve25519dh) {
   blink::WebPushSubscriptionCallbacks* callbacks =
       subscription_callbacks_.Lookup(request_id);
   DCHECK(callbacks);
 
-  scoped_ptr<blink::WebPushSubscription> subscription(
-      new blink::WebPushSubscription(endpoint, curve25519dh));
-  callbacks->onSuccess(subscription.release());
+  callbacks->onSuccess(blink::adoptWebPtr(
+      new blink::WebPushSubscription(endpoint, curve25519dh)));
 
   subscription_callbacks_.Remove(request_id);
 }
 
 void PushMessagingDispatcher::OnSubscribeFromDocumentError(
     int32_t request_id,
     PushRegistrationStatus status) {
   blink::WebPushSubscriptionCallbacks* callbacks =
       subscription_callbacks_.Lookup(request_id);
   DCHECK(callbacks);
 
-  scoped_ptr<blink::WebPushError> error(new blink::WebPushError(
+  callbacks->onError(blink::WebPushError(
       blink::WebPushError::ErrorTypeAbort,
       blink::WebString::fromUTF8(PushRegistrationStatusToString(status))));
-  callbacks->onError(error.release());
 
   subscription_callbacks_.Remove(request_id);
 }
 
 }  // namespace content