def _refresh(self, unused_request):
    # Import httplib2 here since we don't want it as an unnecessary dependency
    # for users who don't integrate with google-api-python-client.
    import httplib2
    self.credentials._refresh(httplib2.Http().request)
Refresh the access_token using the Credentials object.
dataset/ETHPy150Open acil-bwh/SlicerCIP/Scripted/attic/PicasaSnap/gdata/gauth.py/OAuth2TokenFromCredentials._refresh