For example: utf-8 → UTF-8, shift_jis → Shift_JIS
To reflect whatwg/encoding@18bf4fa and whatwg/url@37f9329.

In additional, passing old name to $encodingOverride parameter was deprecated.
lib\URL::parseURL(), lib\URL::parseBasicURL(), lib\URLencoding::parseURLencoded(), and lib\URLencoding::serializeURLencoded() have $encodingOverride parameter.