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

chrome/browser/signin/signin_manager_factory.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/signin/signin_manager_factory.h"
 
 #include "base/prefs/pref_registry_simple.h"
 #include "chrome/browser/profiles/profile_dependency_manager.h"
 #include "chrome/browser/signin/signin_manager.h"
 #include "chrome/browser/signin/token_service_factory.h"
@@ skipping 21 matching lines @@
   return static_cast<SigninManager*>(
       GetInstance()->GetServiceForProfile(profile, false));
 }
 
 // static
 SigninManagerFactory* SigninManagerFactory::GetInstance() {
   return Singleton<SigninManagerFactory>::get();
 }
 
 void SigninManagerFactory::RegisterUserPrefs(PrefRegistrySyncable* registry) {
-  registry->RegisterStringPref(prefs::kGoogleServicesLastUsername, "",
+  registry->RegisterStringPref(prefs::kGoogleServicesLastUsername,
+                               std::string(),
                                PrefRegistrySyncable::UNSYNCABLE_PREF);
-  registry->RegisterStringPref(prefs::kGoogleServicesUsername, "",
+  registry->RegisterStringPref(prefs::kGoogleServicesUsername,
+                               std::string(),
                                PrefRegistrySyncable::UNSYNCABLE_PREF);
   registry->RegisterBooleanPref(prefs::kAutologinEnabled, true,
                                 PrefRegistrySyncable::UNSYNCABLE_PREF);
   registry->RegisterBooleanPref(prefs::kReverseAutologinEnabled, true,
                                 PrefRegistrySyncable::UNSYNCABLE_PREF);
   registry->RegisterListPref(prefs::kReverseAutologinRejectedEmailList,
                              new ListValue,
                              PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 // static
 void SigninManagerFactory::RegisterPrefs(PrefRegistrySimple* registry) {
-  registry->RegisterStringPref(prefs::kGoogleServicesUsernamePattern, "");
+  registry->RegisterStringPref(prefs::kGoogleServicesUsernamePattern,
+                               std::string());
 }
 
 ProfileKeyedService* SigninManagerFactory::BuildServiceInstanceFor(
     Profile* profile) const {
   SigninManager* service = new SigninManager();
   service->Initialize(profile);
   return service;
 }