claat: remove unnecessary dependency x/oauth2/google
claat: remove unnecessary dependency x/oauth2/google

It adds a lot of transient deps.
Just copy google.Endpoint. That's all we need.

chrisrecher/tools,googlecodelabs/tools,Qwiklabs/codelab-tools,googlecodelabs/tools,chrisrecher/tools,CloudVLab/tools,Qwiklabs/codelab-tools,Qwiklabs/codelab-tools,googlecodelabs/tools,googlecodelabs/tools,CloudVLab/tools,Qwiklabs/codelab-tools