Move default_locale manifest handler out of //chrome

extensions/common/manifest_handlers/default_locale_manifest_unittest.cc

Index: extensions/common/manifest_handlers/default_locale_manifest_unittest.cc
diff --git a/chrome/common/extensions/api/i18n/default_locale_manifest_unittest.cc b/extensions/common/manifest_handlers/default_locale_manifest_unittest.cc
similarity index 75%
rename from chrome/common/extensions/api/i18n/default_locale_manifest_unittest.cc
rename to extensions/common/manifest_handlers/default_locale_manifest_unittest.cc
index 351b094c017214a52ea6e1729b057025ff13392d..fd70029087d66e347dda0ba29bd0d9057df0d9d6 100644
--- a/chrome/common/extensions/api/i18n/default_locale_manifest_unittest.cc
+++ b/extensions/common/manifest_handlers/default_locale_manifest_unittest.cc
@@ -2,15 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/common/extensions/api/i18n/default_locale_handler.h"
-#include "chrome/common/extensions/manifest_tests/chrome_manifest_test.h"
 #include "extensions/common/manifest_constants.h"
+#include "extensions/common/manifest_handlers/default_locale_handler.h"
+#include "extensions/common/manifest_test.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace extensions {
 
-class DefaultLocaleManifestTest : public ChromeManifestTest {
-};
+using DefaultLocaleManifestTest = ManifestTest;
 
 TEST_F(DefaultLocaleManifestTest, DefaultLocale) {
   LoadAndExpectError("default_locale_invalid.json",