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

chrome/browser/sync_file_system/drive_file_sync_client.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/sync_file_system/drive_file_sync_client.h"
 
 #include <algorithm>
 #include <functional>
 #include <sstream>
 #include <string>
@@ skipping 111 matching lines @@
 
 }  // namespace
 
 DriveFileSyncClient::DriveFileSyncClient(Profile* profile)
     : url_generator_(GURL(
           google_apis::GDataWapiUrlGenerator::kBaseUrlForProduction)),
       upload_next_key_(0) {
   drive_service_.reset(new google_apis::GDataWapiService(
       profile->GetRequestContext(),
       GURL(google_apis::GDataWapiUrlGenerator::kBaseUrlForProduction),
-      "" /* custom_user_agent */));
+      std::string() /* custom_user_agent */));
   drive_service_->Initialize(profile);
   drive_service_->AddObserver(this);
   net::NetworkChangeNotifier::AddConnectionTypeObserver(this);
 
   drive_uploader_.reset(new google_apis::DriveUploader(drive_service_.get()));
 }
 
 scoped_ptr<DriveFileSyncClient> DriveFileSyncClient::CreateForTesting(
     Profile* profile,
     const GURL& base_url,
@@ skipping 815 matching lines @@
     return;
   for (UploadCallbackMap::iterator iter = upload_callback_map_.begin();
        iter != upload_callback_map_.end(); ++iter) {
     iter->second.Run(error, std::string(), std::string());
   }
   upload_callback_map_.clear();
   drive_uploader_.reset(new google_apis::DriveUploader(drive_service_.get()));
 }
 
 }  // namespace sync_file_system