You can remove applications from Drive through the upper right menu "Wheel"> "Application Management ..."> "Options"> "Delete this application."
If you just want to test the authorization flow again (you know that the first time you open or create a new one, you are viewing the OAuth 2 submission screen), you can go to the next page https://accounts.google.com/IssuedAuthSubTokens . It allows you to deny OAuth access to applications, if you deny access to your application the next time you open or create a new one, you will again see the OAuth 2 confirmation screen.
(Very useful, since only the first time you exchange auth code, you will get an update token)
I would usually make the later one easier to develop than uninstalling + reinstalling the application.
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