Update GCS storage library to support GetObject API on gzipped objects (#6506)

Fixes #6280

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

@@ -2,17 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Package google provides support for making OAuth2 authorized and
-// authenticated HTTP requests to Google APIs.
-// It supports the Web server flow, client-side credentials, service accounts,
-// Google Compute Engine service accounts, and Google App Engine service
-// accounts.
-//
-// For more information, please read
-// https://developers.google.com/accounts/docs/OAuth2
-// and
-// https://developers.google.com/accounts/docs/application-default-credentials.
-package google // import "golang.org/x/oauth2/google"
+package google
 
 import (
 	"encoding/json"