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

google_apis/gaia/google_service_auth_error_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.
 
 #include "google_apis/gaia/google_service_auth_error.h"
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/test/values_test_util.h"
@@ skipping 46 matching lines @@
       GoogleServiceAuthError::FromClientLoginCaptchaChallenge(
           "captcha_token", GURL("http://www.google.com"),
           GURL("http://www.bing.com")));
   scoped_ptr<DictionaryValue> value(error.ToValue());
   EXPECT_EQ(2u, value->size());
   ExpectDictStringValue("CAPTCHA_REQUIRED", *value, "state");
   DictionaryValue* captcha_value = NULL;
   EXPECT_TRUE(value->GetDictionary("captcha", &captcha_value));
   ASSERT_TRUE(captcha_value);
   ExpectDictStringValue("captcha_token", *captcha_value, "token");
-  ExpectDictStringValue("", *captcha_value, "audioUrl");
+  ExpectDictStringValue(std::string(), *captcha_value, "audioUrl");
   ExpectDictStringValue("http://www.google.com/", *captcha_value, "imageUrl");
   ExpectDictStringValue("http://www.bing.com/", *captcha_value, "unlockUrl");
   ExpectDictIntegerValue(0, *captcha_value, "imageWidth");
   ExpectDictIntegerValue(0, *captcha_value, "imageHeight");
 }
 
 TEST_F(GoogleServiceAuthErrorTest, CaptchaChallenge2) {
   GoogleServiceAuthError error(
       GoogleServiceAuthError::FromCaptchaChallenge(
           "captcha_token", GURL("http://www.audio.com"),
@@ skipping 37 matching lines @@
   // Test that a well formed ClientOAuth response generates an invalid
   // credentials error with the given error message.
   GoogleServiceAuthError error2(
       GoogleServiceAuthError::FromClientOAuthError(
           "{\"cause\":\"foo\",\"explanation\":\"error_message\"}"));
   EXPECT_EQ(GoogleServiceAuthError::INVALID_GAIA_CREDENTIALS, error2.state());
   EXPECT_EQ("error_message", error2.error_message());
 }
 
 }  // namespace