external_frame_buffer_test.cc: update copyright

This file was deleted in the initial fork and restored in 2018 with the
WebM copyright. Updating the copyright is acceptable as the author is a
google employee and aomedia member.

Bug: aomedia:3525
Change-Id: Ib0bcae3b72fad5ef10dc4a1c7c1a28b41d3bc87c

test/external_frame_buffer_test.cc

diff --git a/test/external_frame_buffer_test.cc b/test/external_frame_buffer_test.cc
index 8f16c4e..0bf0f6b 100644
--- a/test/external_frame_buffer_test.cc
+++ b/test/external_frame_buffer_test.cc
@@ -1,11 +1,12 @@
 /*
- *  Copyright (c) 2014 The WebM project authors. All Rights Reserved.
+ * Copyright (c) 2018, Alliance for Open Media. All rights reserved
  *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
  */
 
 #include <memory>