After landing bug bug 943283, no one uses nsIPlatformCharset::GetDefaultCharsetForLocale. Also, nsIPlatformCharset isn't scriptable interface, so it is unnecessary now.
MozReview-Commit-ID: Giy68AS9yK2
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extra : rebase_source : a0ae86c5472e1ed74b41c2f6af5cdace353b335d