Revert of Use TaskScheduler instead of WorkerPool in nss_cert_database.cc.

net/cert/nss_cert_database_chromeos.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 "net/cert/nss_cert_database_chromeos.h"
 
 #include <cert.h>
 #include <pk11pub.h>
 
 #include <algorithm>
 #include <memory>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/location.h"
-#include "base/task_scheduler/post_task.h"
+#include "base/task_runner.h"
 #include "net/base/crypto_module.h"
 #include "net/cert/x509_certificate.h"
 
 namespace net {
 
 NSSCertDatabaseChromeOS::NSSCertDatabaseChromeOS(
     crypto::ScopedPK11Slot public_slot,
     crypto::ScopedPK11Slot private_slot)
     : NSSCertDatabase(std::move(public_slot), std::move(private_slot)) {
   // By default, don't use a system slot. Only if explicitly set by
@@ skipping 14 matching lines @@
 void NSSCertDatabaseChromeOS::ListCertsSync(CertificateList* certs) {
   ListCertsImpl(profile_filter_, certs);
 }
 
 void NSSCertDatabaseChromeOS::ListCerts(
     const NSSCertDatabase::ListCertsCallback& callback) {
   std::unique_ptr<CertificateList> certs(new CertificateList());
 
   // base::Pased will NULL out |certs|, so cache the underlying pointer here.
   CertificateList* raw_certs = certs.get();
-  base::PostTaskWithTraitsAndReply(
-      FROM_HERE, base::TaskTraits()
-                     .WithShutdownBehavior(
-                         base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
-                     .MayBlock(),
-      base::Bind(&NSSCertDatabaseChromeOS::ListCertsImpl, profile_filter_,
-                 base::Unretained(raw_certs)),
+  GetSlowTaskRunner()->PostTaskAndReply(
+      FROM_HERE, base::Bind(&NSSCertDatabaseChromeOS::ListCertsImpl,
+                            profile_filter_, base::Unretained(raw_certs)),
       base::Bind(callback, base::Passed(&certs)));
 }
 
 crypto::ScopedPK11Slot NSSCertDatabaseChromeOS::GetSystemSlot() const {
   if (system_slot_)
     return crypto::ScopedPK11Slot(PK11_ReferenceSlot(system_slot_.get()));
   return crypto::ScopedPK11Slot();
 }
 
 void NSSCertDatabaseChromeOS::ListModules(CryptoModuleList* modules,
@@ skipping 22 matching lines @@
                    certs->begin(),
                    certs->end(),
                    NSSProfileFilterChromeOS::CertNotAllowedForProfilePredicate(
                        profile_filter)),
                certs->end());
   DVLOG(1) << "filtered " << pre_size - certs->size() << " of " << pre_size
            << " certs";
 }
 
 }  // namespace net