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

sync/notifier/sync_system_resources.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 "sync/notifier/sync_system_resources.h"
 
 #include <cstdlib>
 #include <cstring>
 #include <string>
 
@@ skipping 163 matching lines @@
   LOG(WARNING) << "ignoring call to ReadAllKeys(callback)";
 }
 
 void SyncStorage::SetSystemResources(
     invalidation::SystemResources* resources) {
   // Do nothing.
 }
 
 void SyncStorage::RunAndDeleteWriteKeyCallback(
     invalidation::WriteKeyCallback* callback) {
-  callback->Run(invalidation::Status(invalidation::Status::SUCCESS, ""));
+  callback->Run(
+      invalidation::Status(invalidation::Status::SUCCESS, std::string()));
   delete callback;
 }
 
 void SyncStorage::RunAndDeleteReadKeyCallback(
     invalidation::ReadKeyCallback* callback, const std::string& value) {
   callback->Run(std::make_pair(
-      invalidation::Status(invalidation::Status::SUCCESS, ""),
+      invalidation::Status(invalidation::Status::SUCCESS, std::string()),
       value));
   delete callback;
 }
 
 SyncSystemResources::SyncSystemResources(
     scoped_ptr<notifier::PushClient> push_client,
     StateWriter* state_writer)
     : is_started_(false),
       logger_(new SyncLogger()),
       internal_scheduler_(new SyncInvalidationScheduler()),
@@ skipping 43 matching lines @@
 
 SyncInvalidationScheduler* SyncSystemResources::internal_scheduler() {
   return internal_scheduler_.get();
 }
 
 SyncInvalidationScheduler* SyncSystemResources::listener_scheduler() {
   return listener_scheduler_.get();
 }
 
 }  // namespace syncer