Since our platform support is Windows 7+, we can replace nsWin32Locale::GetXPLocale with LCIDToLocaleName.
LCIDToLocaleName has LOCALE_SYSTEM_DEFAULT and LOCALE_USER_DEFAULT, so we should it simply.
MozReview-Commit-ID: 7JhhXayIK7S
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extra : rebase_source : d6579e94b8471c73d03c1ac08cdb4b8ab072bed5