Change gae to apache 2 license.

impl/memory/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 memory
 
 import (
         "encoding/binary"
         "sync"
         "time"
 
         "golang.org/x/net/context"
 
@@ skipping 328 matching lines @@
         return cur, nil
 }
 
 func (m *memcacheImpl) Stats() (*mc.Statistics, error) {
         m.data.lock.RLock()
         defer m.data.lock.RUnlock()
 
         ret := m.data.stats
         return &ret, nil
 }