Change gae to apache 2 license.

impl/memory/datastore.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 (
         "errors"
         "fmt"
 
         "golang.org/x/net/context"
 
         ds "github.com/luci/gae/service/datastore"
@@ skipping 238 matching lines @@
         if ns == "" && hasNS {
                 // The user has set an empty namespace. Datastore does not support this
                 // for queries.
                 //
                 // Bug on file is:
                 // https://code.google.com/p/googleappengine/issues/detail?id=12914
                 return errors.New("namespace may not be present and empty")
         }
         return nil
 }