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

chrome/browser/sync/sync_prefs.cc

Index: chrome/browser/sync/sync_prefs.cc
diff --git a/chrome/browser/sync/sync_prefs.cc b/chrome/browser/sync/sync_prefs.cc
index 0c7a4bdc3132dc7055c305c51603fdbb82314107..a5c58e82ea609d9851c97fa00478670f53149926 100644
--- a/chrome/browser/sync/sync_prefs.cc
+++ b/chrome/browser/sync/sync_prefs.cc
@@ -87,10 +87,10 @@ void SyncPrefs::RegisterUserPrefs(PrefRegistrySyncable* registry) {
                                 false,
                                 PrefRegistrySyncable::UNSYNCABLE_PREF);
   registry->RegisterStringPref(prefs::kSyncEncryptionBootstrapToken,
-                               "",
+                               std::string(),
                                PrefRegistrySyncable::UNSYNCABLE_PREF);
   registry->RegisterStringPref(prefs::kSyncKeystoreEncryptionBootstrapToken,
-                               "",
+                               std::string(),
                                PrefRegistrySyncable::UNSYNCABLE_PREF);
 #if defined(OS_CHROMEOS)
   registry->RegisterStringPref(prefs::kSyncSpareBootstrapToken,
@@ -99,7 +99,7 @@ void SyncPrefs::RegisterUserPrefs(PrefRegistrySyncable* registry) {
 #endif
 
   registry->RegisterStringPref(prefs::kSyncSessionsGUID,
-                               "",
+                               std::string(),
                                PrefRegistrySyncable::UNSYNCABLE_PREF);
 
   // We will start prompting people about new data types after the launch of
@@ -181,9 +181,9 @@ void SyncPrefs::SetStartSuppressed(bool is_suppressed) {
 
 std::string SyncPrefs::GetGoogleServicesUsername() const {
   DCHECK(CalledOnValidThread());
-  return
-      pref_service_ ?
-      pref_service_->GetString(prefs::kGoogleServicesUsername) : "";
+  return pref_service_
+             ? pref_service_->GetString(prefs::kGoogleServicesUsername)
+             : std::string();
 }
 
 base::Time SyncPrefs::GetLastSyncedTime() const {
@@ -266,9 +266,9 @@ bool SyncPrefs::IsManaged() const {
 
 std::string SyncPrefs::GetEncryptionBootstrapToken() const {
   DCHECK(CalledOnValidThread());
-  return
-      pref_service_ ?
-      pref_service_->GetString(prefs::kSyncEncryptionBootstrapToken) : "";
+  return pref_service_
+             ? pref_service_->GetString(prefs::kSyncEncryptionBootstrapToken)
+             : std::string();
 }
 
 void SyncPrefs::SetEncryptionBootstrapToken(const std::string& token) {
@@ -278,10 +278,9 @@ void SyncPrefs::SetEncryptionBootstrapToken(const std::string& token) {
 
 std::string SyncPrefs::GetKeystoreEncryptionBootstrapToken() const {
   DCHECK(CalledOnValidThread());
-  return
-      pref_service_ ?
-      pref_service_->GetString(prefs::kSyncKeystoreEncryptionBootstrapToken) :
-      "";
+  return pref_service_ ? pref_service_->GetString(
+                             prefs::kSyncKeystoreEncryptionBootstrapToken)
+                       : std::string();
 }
 
 void SyncPrefs::SetKeystoreEncryptionBootstrapToken(const std::string& token) {
@@ -291,9 +290,8 @@ void SyncPrefs::SetKeystoreEncryptionBootstrapToken(const std::string& token) {
 
 std::string SyncPrefs::GetSyncSessionsGUID() const {
   DCHECK(CalledOnValidThread());
-  return
-      pref_service_ ?
-      pref_service_->GetString(prefs::kSyncSessionsGUID) : "";
+  return pref_service_ ? pref_service_->GetString(prefs::kSyncSessionsGUID)
+                       : std::string();
 }
 
 void SyncPrefs::SetSyncSessionsGUID(const std::string& guid) {