These structs and funcs cannot be used by the end consumer. Unexporting them helps cleans up our documentation
Change-Id: I2eadb69e87de912ac39f53e83cd9bdfe76a15e3e
GitHub-Last-Rev: 60b58eef75
GitHub-Pull-Request: golang/oauth2#479
Reviewed-on: https://go-review.googlesource.com/c/oauth2/+/293752
Reviewed-by: Cody Oss <codyoss@google.com>
Trust: Cody Oss <codyoss@google.com>
Trust: Tyler Bui-Palsulich <tbp@google.com>
Run-TryBot: Cody Oss <codyoss@google.com>
TryBot-Result: Go Bot <gobot@golang.org>