Avoid concatenating scope literals.

google/appengine.go

@@ -3,8 +3,6 @@
 package google
 
 import (
-	"strings"
-
 	"github.com/golang/oauth2"
 
 	"appengine"
@@ -43,7 +41,7 @@ func (c *AppEngineConfig) NewTransport() oauth2.Transport {
 
 // FetchToken fetches a new access token for the provided scopes.
 func (c *AppEngineConfig) FetchToken(existing *oauth2.Token) (*oauth2.Token, error) {
-	token, expiry, err := appengine.AccessToken(c.context, strings.Join(c.scopes, " "))
+	token, expiry, err := appengine.AccessToken(c.context, c.scopes...)
 	if err != nil {
 		return nil, err
 	}