PR #341 introduce some new import `x/net/context` in parallel of PR #339 replacing them with the standard context. This quick PR rename those imports. Change-Id: I94f7edbee851a733b8a307c2ea60923dd990bdb4 GitHub-Last-Rev: fbe7944356b0741b69c075db921add044e5d3745 GitHub-Pull-Request: golang/oauth2#342 Reviewed-on: https://go-review.googlesource.com/c/146837 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>