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

components/autofill/browser/phone_number_i18n_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 "base/message_loop.h"
 #include "base/string16.h"
 #include "base/utf_string_conversions.h"
 #include "components/autofill/browser/phone_number_i18n.h"
 #include "content/public/test/test_browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 319 matching lines @@
 
 TEST(PhoneNumberI18NTest, PhoneNumbersMatch) {
   // Same numbers, defined country code.
   EXPECT_TRUE(PhoneNumbersMatch(ASCIIToUTF16("4158889999"),
                                 ASCIIToUTF16("4158889999"),
                                 "US",
                                 "en-US"));
   // Same numbers, undefined country code.
   EXPECT_TRUE(PhoneNumbersMatch(ASCIIToUTF16("4158889999"),
                                 ASCIIToUTF16("4158889999"),
-                                "",
+                                std::string(),
                                 "en-US"));
 
   // Numbers differ by country code only.
   EXPECT_TRUE(PhoneNumbersMatch(ASCIIToUTF16("14158889999"),
                                 ASCIIToUTF16("4158889999"),
                                 "US",
                                 "en-US"));
 
   // Same numbers, different formats.
   EXPECT_TRUE(PhoneNumbersMatch(ASCIIToUTF16("4158889999"),
@@ skipping 22 matching lines @@
                                  ASCIIToUTF16("8889999"),
                                  "US",
                                  "en-US"));
 
   // Different numbers don't match.
   EXPECT_FALSE(PhoneNumbersMatch(ASCIIToUTF16("14158889999"),
                                  ASCIIToUTF16("1415888"),
                                  "US",
                                  "en-US"));
 }