Move content/child/background_sync to Blink.

content/child/service_worker/web_service_worker_registration_impl.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_CHILD_SERVICE_WORKER_WEB_SERVICE_WORKER_REGISTRATION_IMPL_H_
 #define CONTENT_CHILD_SERVICE_WORKER_WEB_SERVICE_WORKER_REGISTRATION_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 49 matching lines @@
   void getNavigationPreloadState(
       blink::WebServiceWorkerProvider* provider,
       std::unique_ptr<WebGetNavigationPreloadStateCallbacks> callbacks)
       override;
   void setNavigationPreloadHeader(
       const blink::WebString& value,
       blink::WebServiceWorkerProvider* provider,
       std::unique_ptr<WebSetNavigationPreloadHeaderCallbacks> callbacks)
       override;
 
+  int64_t registrationId() const override;

[falken, 2016/11/11 07:59:17]

nit: remove the blank line above (we don't add empty lines between overridden
methods)

[adithyas, 2016/11/11 15:11:56]

Done.

[iclelland, 2016/11/14 18:43:07]

Why the duplication here? Can we remove one or the other instead? (I'm not sure
if this is just a style issue, but it looks redundant)

[iclelland, 2016/11/14 18:44:02]

nm; Now I see the comment in the most recent patch. Thanks!

   int64_t registration_id() const;
 
   using WebServiceWorkerRegistrationHandle =
       blink::WebServiceWorkerRegistration::Handle;
 
   // Creates WebServiceWorkerRegistrationHandle object that owns a reference to
   // the given WebServiceWorkerRegistrationImpl object.
   static std::unique_ptr<WebServiceWorkerRegistrationHandle> CreateHandle(
       const scoped_refptr<WebServiceWorkerRegistrationImpl>& registration);
 
@@ skipping 30 matching lines @@
   blink::WebServiceWorkerRegistrationProxy* proxy_;
 
   std::vector<QueuedTask> queued_tasks_;
 
   DISALLOW_COPY_AND_ASSIGN(WebServiceWorkerRegistrationImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_SERVICE_WORKER_WEB_SERVICE_WORKER_REGISTRATION_IMPL_H_