Removing redundant 'is_null' field in ServiceWorkerVersionInfo

content/browser/service_worker/service_worker_internals_ui.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/browser/service_worker/service_worker_internals_ui.h"
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 198 matching lines @@
   for (std::vector<ServiceWorkerRegistrationInfo>::const_iterator it =
            registrations.begin();
        it != registrations.end();
        ++it) {
     const ServiceWorkerRegistrationInfo& registration = *it;
     DictionaryValue* registration_info = new DictionaryValue();
     registration_info->SetString("scope", registration.pattern.spec());
     registration_info->SetString(
         "registration_id", base::Int64ToString(registration.registration_id));
 
-    if (!registration.active_version.is_null) {
+    if (registration.active_version.version_id != kInvalidServiceWorkerVersionId) {
       DictionaryValue* active_info = new DictionaryValue();
       UpdateVersionInfo(registration.active_version, active_info);
       registration_info->Set("active", active_info);
     }
 
-    if (!registration.waiting_version.is_null) {
+    if (registration.waiting_version.version_id != kInvalidServiceWorkerVersionId) {
       DictionaryValue* waiting_info = new DictionaryValue();
       UpdateVersionInfo(registration.waiting_version, waiting_info);
       registration_info->Set("waiting", waiting_info);
     }
 
     result->Append(registration_info);
   }
   return result;
 }
 
@@ skipping 430 matching lines @@
     return;
   }
 
   base::Callback<void(ServiceWorkerStatusCode)> callback =
       base::Bind(OperationCompleteCallback, AsWeakPtr(), callback_id);
   FindRegistrationForPattern(
       context, GURL(scope_string), base::Bind(StartActiveWorker, callback));
 }
 
 }  // namespace content