Toshi MARUYAMA fb75372b86 scm: attachment: remove "to_utf8" methods from helpers (#2371)
It is confusing that same name methods are in several helpers.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@7871 e93f8b46-1217-0410-a6f0-8f06a7374b81
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