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

net/http/http_auth.cc

 // Copyright (c) 2011 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 "net/http/http_auth.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/string_util.h"
@@ skipping 128 matching lines @@
 
 // static
 std::string HttpAuth::GetChallengeHeaderName(Target target) {
   switch (target) {
     case AUTH_PROXY:
       return "Proxy-Authenticate";
     case AUTH_SERVER:
       return "WWW-Authenticate";
     default:
       NOTREACHED();
-      return "";
+      return std::string();
   }
 }
 
 // static
 std::string HttpAuth::GetAuthorizationHeaderName(Target target) {
   switch (target) {
     case AUTH_PROXY:
       return HttpRequestHeaders::kProxyAuthorization;
     case AUTH_SERVER:
       return HttpRequestHeaders::kAuthorization;
     default:
       NOTREACHED();
-      return "";
+      return std::string();
   }
 }
 
 // static
 std::string HttpAuth::GetAuthTargetString(Target target) {
   switch (target) {
     case AUTH_PROXY:
       return "proxy";
     case AUTH_SERVER:
       return "server";
     default:
       NOTREACHED();
-      return "";
+      return std::string();
   }
 }
 
 // static
 const char* HttpAuth::SchemeToString(Scheme scheme) {
   static const char* const kSchemeNames[] = {
     "basic",
     "digest",
     "ntlm",
     "negotiate",
     "spdyproxy",
     "mock",
   };
   COMPILE_ASSERT(arraysize(kSchemeNames) == AUTH_SCHEME_MAX,
                  http_auth_scheme_names_incorrect_size);
   if (scheme < AUTH_SCHEME_BASIC || scheme >= AUTH_SCHEME_MAX) {
     NOTREACHED();
     return "invalid_scheme";
   }
   return kSchemeNames[scheme];
 }
 
 }  // namespace net