Set locale for extension tests, keep it from affecting global state

chrome/browser/extensions/extension_service_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 "chrome/browser/extensions/extension_service_unittest.h"
 
 #include <algorithm>
 #include <set>
 #include <vector>
 
@@ skipping 41 matching lines @@
 #include "chrome/browser/plugin_prefs_factory.h"
 #include "chrome/browser/prefs/browser_prefs.h"
 #include "chrome/browser/prefs/pref_service_mock_builder.h"
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
 #include "chrome/browser/themes/theme_service_factory.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension.h"
+#include "chrome/common/extensions/extension_l10n_util.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
 #include "chrome/common/extensions/extension_resource.h"
 #include "chrome/common/extensions/permissions/permission_set.h"
 #include "chrome/common/extensions/url_pattern.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/string_ordinal.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/browser/dom_storage_context.h"
 #include "content/public/browser/indexed_db_context.h"
@@ skipping 3930 matching lines @@
       "    \"external_crx\": \"RandomExtension.crx\","
       "    \"external_version\": \"1.0\","
       "    \"is_bookmark_app\": true"
       "  }"
       "}";
   EXPECT_EQ(1, from_bookmark_visitor.Visit(json_data));
 }
 
 // Test loading good extensions from the profile directory.
 TEST_F(ExtensionServiceTest, LoadAndRelocalizeExtensions) {
+  // Ensure we're testing in "en" and leave global state untouched.
+  extension_l10n_util::ScopedLocaleForTest testLocale("en");
+
   // Initialize the test dir with a good Preferences/extensions.
   FilePath source_install_dir = data_dir_
       .AppendASCII("l10n");
   FilePath pref_path = source_install_dir.AppendASCII("Preferences");
   InitializeInstalledExtensionService(pref_path, source_install_dir);
 
   service_->Init();
 
   ASSERT_EQ(3u, loaded_.size());
 
@@ skipping 1220 matching lines @@
   // This should NOT trigger an alert.
   provider->UpdateOrAddExtension(hosted_app, "1.0.0.0",
                                  data_dir_.AppendASCII("hosted_app.crx"));
 
   service_->CheckForExternalUpdates();
   loop_.RunAllPending();
 
   ASSERT_TRUE(service_->PopulateExtensionErrorUI(extension_error_ui.get()));
   ASSERT_EQ(1u, extension_error_ui->get_external_extension_ids()->size());
 }