chrome/test/data/extensions/bad_underscore/manifest.json - chromium/src - Git at Google

 {
   "name": "foo",
   "version": "1",
   "manifest_version": 2,
   "description": "Test that an extension with a directory with a trailing underscore is still allowed to load (it's a warning, not an error). Note the directory here is incorrectly named `_locale` instead of `_locales`."
 }
	{
	"name": "foo",
	"version": "1",
	"manifest_version": 2,
	"description": "Test that an extension with a directory with a trailing underscore is still allowed to load (it's a warning, not an error). Note the directory here is incorrectly named `_locale` instead of `_locales`."
	}