Change gae to apache 2 license.

service/user/interface.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 user
 
 // Interface provides access to the "appengine/users" API methods.
 type Interface interface {
         Current() *User
         CurrentOAuth(scopes ...string) (*User, error)
 
         IsAdmin() bool
 
         LoginURL(dest string) (string, error)
         LoginURLFederated(dest, identity string) (string, error)
         LogoutURL(dest string) (string, error)
 
         OAuthConsumerKey() (string, error)
 
         // If this implementation supports it, this will return an instance of the
         // Testable object for this service, which will let you 'log in' virtual users
         // in your test cases. If the implementation doesn't support it, it will
         // return nil.
         Testable() Testable
 }