http://docs.closure-library.googlecode.com/git/closure_goog_locale_locale.js.source.html#line161
This method depends on goog.locale.LocaleNameConstants__ available from
http://go/js_locale_data
. User of this method has to add dependency to this.
also:
https://groups.google.com/forum/#!topic/closure-library-discuss/1fQ-GmNmLgM
We're deprecating the goog.locale package in favor of the goog.i18n functions, which don't require the mysterious locale data referenced in the comments (it's just a directory filled with translated strings, which is now obsolete).