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

chrome/browser/ui/webui/options/managed_user_passphrase_handler.cc

 // Copyright (c) 2013 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/ui/webui/options/managed_user_passphrase_handler.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
 #include "base/values.h"
@@ skipping 92 matching lines @@
   PrefService* pref_service = Profile::FromWebUI(web_ui())->GetPrefs();
   base::FundamentalValue is_passphrase_set(!pref_service->GetString(
       prefs::kManagedModeLocalPassphrase).empty());
   web_ui()->CallJavascriptFunction(callback_function_name,
                                    is_passphrase_set);
 }
 
 void ManagedUserPassphraseHandler::ResetPassphrase(
     const base::ListValue* args) {
   PrefService* pref_service = Profile::FromWebUI(web_ui())->GetPrefs();
-  pref_service->SetString(prefs::kManagedModeLocalPassphrase, "");
-  pref_service->SetString(prefs::kManagedModeLocalSalt, "");
+  pref_service->SetString(prefs::kManagedModeLocalPassphrase, std::string());
+  pref_service->SetString(prefs::kManagedModeLocalSalt, std::string());
 }
 
 void ManagedUserPassphraseHandler::SetLocalPassphrase(
     const base::ListValue* args) {
   // Only change the passphrase if the custodian is authenticated.
   if (!ManagedModeNavigationObserver::FromWebContents(
       web_ui()->GetWebContents())->is_elevated())
     return;
 
   std::string passphrase;
   args->GetString(0, &passphrase);
   ManagedUserPassphrase passphrase_key_generator((std::string()));
   std::string encoded_passphrase_hash;
   bool success = passphrase_key_generator.GenerateHashFromPassphrase(
       passphrase,
       &encoded_passphrase_hash);
   if (success) {
     PrefService* pref_service = Profile::FromWebUI(web_ui())->GetPrefs();
     pref_service->SetString(prefs::kManagedModeLocalPassphrase,
                             encoded_passphrase_hash);
     pref_service->SetString(prefs::kManagedModeLocalSalt,
                             passphrase_key_generator.GetSalt());
   }
   // TODO(akuegel): Give failure back to the UI.
 }
 
 }  // namespace options