Fix dependencies

vendor/golang.org/x/oauth2/internal/oauth2.go

@@ -1,37 +0,0 @@
-// Copyright 2014 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package internal
-
-import (
-	"crypto/rsa"
-	"crypto/x509"
-	"encoding/pem"
-	"errors"
-	"fmt"
-)
-
-// ParseKey converts the binary contents of a private key file
-// to an *rsa.PrivateKey. It detects whether the private key is in a
-// PEM container or not. If so, it extracts the the private key
-// from PEM container before conversion. It only supports PEM
-// containers with no passphrase.
-func ParseKey(key []byte) (*rsa.PrivateKey, error) {
-	block, _ := pem.Decode(key)
-	if block != nil {
-		key = block.Bytes
-	}
-	parsedKey, err := x509.ParsePKCS8PrivateKey(key)
-	if err != nil {
-		parsedKey, err = x509.ParsePKCS1PrivateKey(key)
-		if err != nil {
-			return nil, fmt.Errorf("private key should be a PEM or plain PKCS1 or PKCS8; parse error: %v", err)
-		}
-	}
-	parsed, ok := parsedKey.(*rsa.PrivateKey)
-	if !ok {
-		return nil, errors.New("private key is invalid")
-	}
-	return parsed, nil
-}