Removes google-oauth dependency

[cgorman]

google-oauth seems to be a dead project and is not/no longer used anywhere in this package. I'm having issues installing the package currently due to this dependency. I think the build is no longer available? My one hesitation is that I can't seem to find where this library was ever used so there may be something I'm missing. @hackermd can you shed any light on this?

[hackermd]

@cgorman not sure why this dependency was added. If it's not needed, let's remove it.

[cgorman]

Oops, sorry for the delay in merging. I think I had seen the approval and marked it off of my mental list without actually completing it.