Shut down the ServiceWorker system as the browser's shutting down.

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 <vector>
 
 #include "base/message_loop/message_loop.h"
 #include "content/browser/service_worker/service_worker_context_core.h"
@@ skipping 20 matching lines @@
     const GURL& script_url)
     : context_(context),
       pattern_(pattern),
       script_url_(script_url),
       phase_(INITIAL),
       is_promise_resolved_(false),
       promise_resolved_status_(SERVICE_WORKER_OK),
       weak_factory_(this) {}
 
 ServiceWorkerRegisterJob::~ServiceWorkerRegisterJob() {
-  DCHECK(phase_ == INITIAL || phase_ == COMPLETE);
+  DCHECK(!context_ || phase_ == INITIAL || phase_ == COMPLETE)
+      << "Jobs should only be interrupted during shutdown.";
 }
 
 void ServiceWorkerRegisterJob::AddCallback(const RegistrationCallback& callback,
                                            int process_id) {
   if (!is_promise_resolved_) {
     callbacks_.push_back(callback);
     if (process_id != -1 && (phase_ < UPDATE || !pending_version()))
       pending_process_ids_.push_back(process_id);
     return;
   }
@@ skipping 354 matching lines @@
        !it->IsAtEnd();
        it->Advance()) {
     ServiceWorkerProviderHost* provider_host = it->GetProviderHost();
     if (ServiceWorkerUtils::ScopeMatches(pattern_,
                                          provider_host->document_url()))
       provider_host->SetPendingVersion(version);
   }
 }
 
 }  // namespace content