Change gae to apache 2 license.

service/memcache/errors.go

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
+// Copyright 2015 The LUCI Authors. All rights reserved.
+// Use of this source code is governed under the Apache License, Version 2.0
+// that can be found in the LICENSE file.
 
 // This file contains errors which are mirrors/duplicates of the
 // upstream SDK errors. This exists so that users can depend solely on this
 // wrapper library without also needing to import the SDK.
 
 package memcache
 
 import (
         orig "google.golang.org/appengine/memcache"
 )
 
 // These are pass-through versions from the managed-VM SDK. All implementations
 // must return these (exact) errors (not just an error with the same text).
 var (
         ErrCacheMiss   = orig.ErrCacheMiss
         ErrCASConflict = orig.ErrCASConflict
         ErrNoStats     = orig.ErrNoStats
         ErrNotStored   = orig.ErrNotStored
         ErrServerError = orig.ErrServerError
 )