Use tri-state enum for the existence of Fetch Handler in ServiceWorkerVersion.

content/browser/service_worker/service_worker_register_job.cc

 // Copyright 2013 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_register_job.h"
 
 #include <stdint.h>
 
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 451 matching lines @@
     return;
   }
 
   ServiceWorkerMetrics::RecordInstallEventStatus(status);
   ServiceWorkerMetrics::RecordForeignFetchRegistrationCount(
       new_version()->foreign_fetch_scopes().size(),
       new_version()->foreign_fetch_origins().size());
 
   SetPhase(STORE);
   DCHECK(!registration()->last_update_check().is_null());
-  new_version()->set_has_fetch_handler(has_fetch_handler);
+  new_version()->set_fetch_handler_existence(
+      has_fetch_handler
+          ? ServiceWorkerVersion::FetchHandlerExistence::EXISTS
+          : ServiceWorkerVersion::FetchHandlerExistence::DOES_NOT_EXIST);
   context_->storage()->StoreRegistration(
       registration(),
       new_version(),
       base::Bind(&ServiceWorkerRegisterJob::OnStoreRegistrationComplete,
                  weak_factory_.GetWeakPtr()));
 }
 
 void ServiceWorkerRegisterJob::OnInstallFailed(ServiceWorkerStatusCode status) {
   ServiceWorkerMetrics::RecordInstallEventStatus(status);
 
@@ skipping 159 matching lines @@
       new_version()->force_bypass_cache_for_scripts() ||
       registration()->last_update_check().is_null()) {
     registration()->set_last_update_check(base::Time::Now());
 
     if (registration()->has_installed_version())
       context_->storage()->UpdateLastUpdateCheckTime(registration());
   }
 }
 
 }  // namespace content