Rewrite std::string("") to std::string(), Linux edition.

chrome/browser/certificate_manager_model.cc

 // Copyright (c) 2012 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 "chrome/browser/certificate_manager_model.h"
 
 #include "base/bind.h"
 #include "base/i18n/time_formatting.h"
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
@@ skipping 20 matching lines @@
 }
 
 void CertificateManagerModel::Refresh() {
   VLOG(1) << "refresh started";
   net::CryptoModuleList modules;
   cert_db_->ListModules(&modules, false);
   VLOG(1) << "refresh waiting for unlocking...";
   chrome::UnlockSlotsIfNecessary(
       modules,
       chrome::kCryptoModulePasswordListCerts,
-      "",  // unused.
+      std::string(),  // unused.
       base::Bind(&CertificateManagerModel::RefreshSlotsUnlocked,
                  base::Unretained(this)));
 }
 
 void CertificateManagerModel::RefreshSlotsUnlocked() {
   VLOG(1) << "refresh listing certs...";
   cert_db_->ListCerts(&cert_list_);
   observer_->CertificatesRefreshed();
   VLOG(1) << "refresh finished";
 }
@@ skipping 36 matching lines @@
             rv,
             l10n_util::GetStringUTF16(IDS_CERT_MANAGER_HARDWARE_BACKED));
       }
 #endif
       break;
     case COL_CERTIFICATE_STORE:
       rv = UTF8ToUTF16(
           x509_certificate_model::GetTokenName(cert.os_cert_handle()));
       break;
     case COL_SERIAL_NUMBER:
-      rv = ASCIIToUTF16(
-          x509_certificate_model::GetSerialNumberHexified(
-              cert.os_cert_handle(), ""));
+      rv = ASCIIToUTF16(x509_certificate_model::GetSerialNumberHexified(
+          cert.os_cert_handle(), std::string()));
       break;
     case COL_EXPIRES_ON:
       if (!cert.valid_expiry().is_null())
         rv = base::TimeFormatShortDateNumeric(cert.valid_expiry());
       break;
     default:
       NOTREACHED();
   }
   return rv;
 }
@@ skipping 47 matching lines @@
 bool CertificateManagerModel::IsHardwareBacked(
     const net::X509Certificate* cert) const {
 #if defined(OS_CHROMEOS)
   return crypto::IsTPMTokenReady() &&
          cert->os_cert_handle()->slot ==
              cert_db_->GetPrivateModule()->os_module_handle();
 #else
   return false;
 #endif
 }