Rename MimeType's getCharSet() to getCharset() [SPR-14172]

[spring-projects-issues]

Juergen Hoeller opened SPR-14172 and commented

Since the Java return type is actually Charset, it is rather odd for the method to be cased differently. Also, CharSet suggests a kind of java.util.Set which it really isn't. Let's streamline this for 4.3, keeping the old method in deprecated form for the time being.

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No further details from SPR-14172