Change gae to apache 2 license.

service/memcache/memcache.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.
 
 package memcache
 
 import (
         "github.com/luci/luci-go/common/errors"
         "golang.org/x/net/context"
 )
 
 type memcacheImpl struct{ RawInterface }
 
@@ skipping 107 matching lines @@
 func (m *memcacheImpl) IncrementExisting(key string, delta int64) (newValue uint64, err error) {
         return m.RawInterface.Increment(key, delta, nil)
 }
 
 func (m *memcacheImpl) Raw() RawInterface { return m.RawInterface }
 
 // Get gets the current memcache implementation from the context.
 func Get(c context.Context) Interface {
         return &memcacheImpl{GetRaw(c)}
 }