Revert "App Engine Managed VMs should depend on url fetcher."

This reverts commit 4901e89da7.

google/appenginevm.go

@@ -3,12 +3,11 @@
 package google
 
 import (
+	"net/http"
 	"strings"
 
 	"github.com/golang/oauth2"
-
 	"google.golang.org/appengine"
-	"google.golang.org/appengine/urlfetch"
 )
 
 // AppEngineConfig represents a configuration for an
@@ -27,12 +26,7 @@ func NewAppEngineConfig(context appengine.Context, scopes []string) *AppEngineCo
 // NewTransport returns a transport that authorizes
 // the requests with the application's service account.
 func (c *AppEngineConfig) NewTransport() oauth2.Transport {
-	transport := &urlfetch.Transport{
-		Context:                       c.context,
-		Deadline:                      0,
-		AllowInvalidServerCertificate: false,
-	}
-	return oauth2.NewAuthorizedTransport(transport, c, nil)
+	return oauth2.NewAuthorizedTransport(http.DefaultTransport, c, nil)
 }
 
 // FetchToken fetches a new access token for the provided scopes.