Leaking locale changes is a Very Bad Idea.

chrome/browser/net/client_hints_unittest.cc

Index: chrome/browser/net/client_hints_unittest.cc
diff --git a/chrome/browser/net/client_hints_unittest.cc b/chrome/browser/net/client_hints_unittest.cc
index c93b3b66d50597303c6e400758d25d4bada777d3..828db69854b8eb3690b62aafd3be5edacd9d1a29 100644
--- a/chrome/browser/net/client_hints_unittest.cc
+++ b/chrome/browser/net/client_hints_unittest.cc
@@ -4,9 +4,8 @@
 
 #include "chrome/browser/net/client_hints.h"
 
-#include <locale.h>
-
 #include "base/logging.h"
+#include "base/test/scoped_locale.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class ClientHintsTest : public testing::Test {
@@ -26,7 +25,7 @@ TEST_F(ClientHintsTest, HintsWellFormatted) {
 }
 
 TEST_F(ClientHintsTest, HintsWellFormattedWithNonEnLocale) {
-  setlocale(LC_ALL, "fr_FR.UTF-8");
+  base::ScopedLocale locale("fr_FR.UTF-8");
   UpdateScreenInfo(1.567f);
   std::string hint = client_hints_.GetDevicePixelRatioHeader();
   EXPECT_EQ("1.57", hint);