Bug 213517 part 1 - Interpret x-user-defined as windows-1252 in <meta> for compatibility with other browsers. r=smontagu.

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rename : parser/htmlparser/tests/mochitest/file_bug672453_meta_utf16.html => parser/htmlparser/tests/mochitest/file_bug672453_meta_userdefined.html
Bug 213517 part 2 - Remove the x-user-def language group. r=jfkthame.