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

chrome/browser/language_usage_metrics_unittest.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 "chrome/browser/language_usage_metrics.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 TEST(LanguageUsageMetricsTest, ParseAcceptLanguages) {
   std::set<Language> language_set;
   std::set<Language>::const_iterator it;
 
   // Basic single language case.
   LanguageUsageMetrics::ParseAcceptLanguages("ja", &language_set);
   EXPECT_EQ(1U, language_set.size());
   EXPECT_EQ(JAPANESE, *language_set.begin());
 
   // Empty language.
-  LanguageUsageMetrics::ParseAcceptLanguages("", &language_set);
+  LanguageUsageMetrics::ParseAcceptLanguages(std::string(), &language_set);
   EXPECT_EQ(0U, language_set.size());
 
   // Country code is ignored.
   LanguageUsageMetrics::ParseAcceptLanguages("ja-JP", &language_set);
   EXPECT_EQ(1U, language_set.size());
   EXPECT_EQ(JAPANESE, *language_set.begin());
 
   // Case is ignored.
   LanguageUsageMetrics::ParseAcceptLanguages("Ja-jP", &language_set);
   EXPECT_EQ(1U, language_set.size());
@@ skipping 49 matching lines @@
   // Basic case.
   EXPECT_EQ(JAPANESE, LanguageUsageMetrics::ToLanguage("ja"));
 
   // Case is ignored.
   EXPECT_EQ(SPANISH, LanguageUsageMetrics::ToLanguage("Es"));
 
   // Coutry code is ignored.
   EXPECT_EQ(JAPANESE, LanguageUsageMetrics::ToLanguage("ja-JP"));
 
   // Invalid locales are considered as unknown language.
-  EXPECT_EQ(UNKNOWN_LANGUAGE, LanguageUsageMetrics::ToLanguage(""));
+  EXPECT_EQ(UNKNOWN_LANGUAGE, LanguageUsageMetrics::ToLanguage(std::string()));
   EXPECT_EQ(UNKNOWN_LANGUAGE, LanguageUsageMetrics::ToLanguage("xx"));
 }