ここを参照。
[Change Gmail account to make in-app purchase?]
http://android.stackexchange.com/questions/70215/change-gmail-account-to-make-in-app-purchase
答えの翻訳(概要)：
1.アプリをアンインストールする
2.使いたいアカウントで、アプリをインストールする
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