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

chrome/browser/signin/signin_internals_util.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_internals_util.h"
 
 #include <sstream>
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 80 matching lines @@
 }
 
 #define ENUM_CASE(x) case x: return (std::string(kSigninPrefPrefix) + #x)
 std::string SigninStatusFieldToString(UntimedSigninStatusField field) {
   switch (field) {
     ENUM_CASE(USERNAME);
     ENUM_CASE(SID);
     ENUM_CASE(LSID);
     case UNTIMED_FIELDS_END:
       NOTREACHED();
-      return "";
+      return std::string();
   }
 
   NOTREACHED();
-  return "";
+  return std::string();
 }
 
 std::string SigninStatusFieldToString(TimedSigninStatusField field) {
   switch (field) {
     ENUM_CASE(SIGNIN_TYPE);
     ENUM_CASE(CLIENT_LOGIN_STATUS);
     ENUM_CASE(OAUTH_LOGIN_STATUS);
     ENUM_CASE(GET_USER_INFO_STATUS);
     case TIMED_FIELDS_END:
       NOTREACHED();
-      return "";
+      return std::string();
   }
 
   NOTREACHED();
-  return "";
+  return std::string();
 }
 
 SigninStatus::SigninStatus()
     :untimed_signin_fields(UNTIMED_FIELDS_COUNT),
      timed_signin_fields(TIMED_FIELDS_COUNT) {
 }
 
 SigninStatus::~SigninStatus() {
 }
 
@@ skipping 65 matching lines @@
 std::string SigninStatusFieldToLabel(UntimedSigninStatusField field) {
   switch (field) {
     case USERNAME:
       return "User Id";
     case LSID:
       return "Lsid (Hash)";
     case SID:
       return "Sid (Hash)";
     case UNTIMED_FIELDS_END:
       NOTREACHED();
-      return "";
+      return std::string();
   }
   NOTREACHED();
-  return "";
+  return std::string();
 }
 
 TimedSigninStatusValue SigninStatusFieldToLabel(
     TimedSigninStatusField field) {
   switch (field) {
     case SIGNIN_TYPE:
       return TimedSigninStatusValue("Type", "Time");
     case CLIENT_LOGIN_STATUS:
       return TimedSigninStatusValue("Last OnClientLogin Status",
                                     "Last OnClientLogin Time");
     case OAUTH_LOGIN_STATUS:
       return TimedSigninStatusValue("Last OnOAuthLogin Status",
                                     "Last OnOAuthLogin Time");
 
     case GET_USER_INFO_STATUS:
       return TimedSigninStatusValue("Last OnGetUserInfo Status",
                                     "Last OnGetUserInfo Time");
     case TIMED_FIELDS_END:
       NOTREACHED();
-      return TimedSigninStatusValue("Error", "");
+      return TimedSigninStatusValue("Error", std::string());
   }
   NOTREACHED();
-  return TimedSigninStatusValue("Error", "");
+  return TimedSigninStatusValue("Error", std::string());
 }
 
 } //  namespace
 
 scoped_ptr<DictionaryValue> SigninStatus::ToValue() {
   scoped_ptr<DictionaryValue> signin_status(new DictionaryValue());
   ListValue* signin_info = new ListValue();
   signin_status->Set("signin_info", signin_info);
 
   // A summary of signin related info first.
@@ skipping 41 matching lines @@
   for (std::map<std::string, TokenInfo>::iterator it = token_info_map.begin();
        it != token_info_map.end(); ++it) {
     DictionaryValue* token_info = it->second.ToValue();
     token_details->Append(token_info);
   }
 
   return signin_status.Pass();
 }
 
 } //  namespace signin_internals_util