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

chrome/browser/signin/token_service_unittest.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.
 //
 // This file defines a unit test for the profile's token service.
 
 #include "chrome/browser/signin/token_service_unittest.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 207 matching lines @@
 TEST_F(TokenServiceTest, OnTokenSuccessUpdate) {
   service_->OnIssueAuthTokenSuccess(GaiaConstants::kSyncService, "token");
   EXPECT_TRUE(service_->HasTokenForService(GaiaConstants::kSyncService));
   EXPECT_EQ(service_->GetTokenForService(GaiaConstants::kSyncService), "token");
 
   service_->OnIssueAuthTokenSuccess(GaiaConstants::kSyncService, "token2");
   EXPECT_TRUE(service_->HasTokenForService(GaiaConstants::kSyncService));
   EXPECT_EQ(service_->GetTokenForService(GaiaConstants::kSyncService),
             "token2");
 
-  service_->OnIssueAuthTokenSuccess(GaiaConstants::kSyncService, "");
+  service_->OnIssueAuthTokenSuccess(GaiaConstants::kSyncService, std::string());
   EXPECT_TRUE(service_->HasTokenForService(GaiaConstants::kSyncService));
   EXPECT_EQ(service_->GetTokenForService(GaiaConstants::kSyncService), "");
 }
 
 TEST_F(TokenServiceTest, OnOAuth2LoginTokenSuccessUpdate) {
   std::string service = GaiaConstants::kGaiaOAuth2LoginRefreshToken;
   service_->OnClientOAuthSuccess(
       GaiaAuthConsumer::ClientOAuthResult("rt1", "at1", 3600));
   EXPECT_TRUE(service_->HasOAuthLoginToken());
   EXPECT_EQ(service_->GetOAuth2LoginRefreshToken(), "rt1");
@@ skipping 178 matching lines @@
 
     *CommandLine::ForCurrentProcess() = original_cl;
   }
 };
 
 TEST_F(TokenServiceCommandLineTest, TestValueOverride) {
   EXPECT_TRUE(service_->HasTokenForService("my_service"));
   EXPECT_EQ("my_value", service_->GetTokenForService("my_service"));
 }
 #endif   // ifndef NDEBUG