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

chrome/browser/language_usage_metrics_unittest.cc

Index: chrome/browser/language_usage_metrics_unittest.cc
diff --git a/chrome/browser/language_usage_metrics_unittest.cc b/chrome/browser/language_usage_metrics_unittest.cc
index db6e987e919bee604e333293f55624e466cd7a3f..e007e70521431c5e373b697ab61f85ab0ee0f3a2 100644
--- a/chrome/browser/language_usage_metrics_unittest.cc
+++ b/chrome/browser/language_usage_metrics_unittest.cc
@@ -16,7 +16,7 @@ TEST(LanguageUsageMetricsTest, ParseAcceptLanguages) {
   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.
@@ -86,6 +86,6 @@ TEST(LanguageUsageMetricsTest, ToLanguage) {
   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"));
 }