Update cri to f1d492b0cd.

Signed-off-by: Lantao Liu <lantaol@google.com>

vendor/golang.org/x/oauth2/README.md

@@ -11,64 +11,25 @@ oauth2 package contains a client implementation for OAuth 2.0 spec.
 go get golang.org/x/oauth2
 ~~~~
 
+Or you can manually git clone the repository to
+`$(go env GOPATH)/src/golang.org/x/oauth2`.
+
 See godoc for further documentation and examples.
 
 * [godoc.org/golang.org/x/oauth2](http://godoc.org/golang.org/x/oauth2)
 * [godoc.org/golang.org/x/oauth2/google](http://godoc.org/golang.org/x/oauth2/google)
 
+## Policy for new packages
 
-## App Engine
+We no longer accept new provider-specific packages in this repo. For
+defining provider endpoints and provider-specific OAuth2 behavior, we
+encourage you to create packages elsewhere. We'll keep the existing
+packages for compatibility.
 
-In change 96e89be (March 2015) we removed the `oauth2.Context2` type in favor
-of the [`context.Context`](https://golang.org/x/net/context#Context) type from
-the `golang.org/x/net/context` package
+## Report Issues / Send Patches
 
-This means its no longer possible to use the "Classic App Engine"
-`appengine.Context` type with the `oauth2` package. (You're using
-Classic App Engine if you import the package `"appengine"`.)
+This repository uses Gerrit for code changes. To learn how to submit changes to
+this repository, see https://golang.org/doc/contribute.html.
 
-To work around this, you may use the new `"google.golang.org/appengine"`
-package. This package has almost the same API as the `"appengine"` package,
-but it can be fetched with `go get` and used on "Managed VMs" and well as
-Classic App Engine.
-
-See the [new `appengine` package's readme](https://github.com/golang/appengine#updating-a-go-app-engine-app)
-for information on updating your app.
-
-If you don't want to update your entire app to use the new App Engine packages,
-you may use both sets of packages in parallel, using only the new packages
-with the `oauth2` package.
-
-	import (
-		"golang.org/x/net/context"
-		"golang.org/x/oauth2"
-		"golang.org/x/oauth2/google"
-		newappengine "google.golang.org/appengine"
-		newurlfetch "google.golang.org/appengine/urlfetch"
-
-		"appengine"
-	)
-
-	func handler(w http.ResponseWriter, r *http.Request) {
-		var c appengine.Context = appengine.NewContext(r)
-		c.Infof("Logging a message with the old package")
-
-		var ctx context.Context = newappengine.NewContext(r)
-		client := &http.Client{
-			Transport: &oauth2.Transport{
-				Source: google.AppEngineTokenSource(ctx, "scope"),
-				Base:   &newurlfetch.Transport{Context: ctx},
-			},
-		}
-		client.Get("...")
-	}
-
-## Contributing
-
-We appreciate your help!
-
-To contribute, please read the contribution guidelines:
-	https://golang.org/doc/contribute.html
-
-Note that the Go project does not use GitHub pull requests but
-uses Gerrit for code reviews. See the contribution guide for details.
+The main issue tracker for the oauth2 repository is located at
+https://github.com/golang/oauth2/issues.