Implement some follow-ups after mojofiction of Push-messaging.

content/renderer/push_messaging/push_messaging_client.h

 // 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.
 
 #ifndef CONTENT_RENDERER_PUSH_MESSAGING_PUSH_MESSAGING_CLIENT_H_
 #define CONTENT_RENDERER_PUSH_MESSAGING_PUSH_MESSAGING_CLIENT_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 41 matching lines @@
       std::unique_ptr<blink::WebPushSubscriptionCallbacks> callbacks,
       const GURL& manifest_url,
       const Manifest& manifest,
       const ManifestDebugInfo&);
 
   void DoSubscribe(
       blink::WebServiceWorkerRegistration* service_worker_registration,
       const PushSubscriptionOptions& options,
       std::unique_ptr<blink::WebPushSubscriptionCallbacks> callbacks);
 
-  void SubscribeCallback(
+  void DidSubscribe(
       std::unique_ptr<blink::WebPushSubscriptionCallbacks> callbacks,
       content::PushRegistrationStatus status,
       const base::Optional<GURL>& endpoint,
       const base::Optional<content::PushSubscriptionOptions>& options,
       const base::Optional<std::vector<uint8_t>>& p256dh,
       const base::Optional<std::vector<uint8_t>>& auth);
 
   mojom::PushMessagingPtr push_messaging_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(PushMessagingClient);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PUSH_MESSAGING_PUSH_MESSAGING_CLIENT_H_