Removing redundant 'is_null' field in ServiceWorkerVersionInfo

content/browser/service_worker/service_worker_info.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_BROWSER_SERVICE_WORKER_SERVICE_WORKER_INFO_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_INFO_H_
 
 #include <vector>
 
 #include "content/browser/service_worker/service_worker_version.h"
 #include "content/common/content_export.h"
 #include "url/gurl.h"
 
 namespace content {
 
 class CONTENT_EXPORT ServiceWorkerVersionInfo {
  public:
   ServiceWorkerVersionInfo();
   ServiceWorkerVersionInfo(ServiceWorkerVersion::RunningStatus running_status,
                            ServiceWorkerVersion::Status status,
                            const GURL& script_url,
                            int64 version_id,
                            int process_id,
                            int thread_id,
                            int devtools_agent_route_id);
   ~ServiceWorkerVersionInfo();
 
-  bool is_null;
   ServiceWorkerVersion::RunningStatus running_status;
   ServiceWorkerVersion::Status status;
   GURL script_url;
   int64 version_id;
   int process_id;
   int thread_id;
   int devtools_agent_route_id;
 };
 
 class CONTENT_EXPORT ServiceWorkerRegistrationInfo {
@@ skipping 11 matching lines @@
   int64 registration_id;
   ServiceWorkerVersionInfo controlling_version;
   ServiceWorkerVersionInfo active_version;
   ServiceWorkerVersionInfo waiting_version;
   ServiceWorkerVersionInfo installing_version;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_INFO_H_