libvpx: generated files do not need copyright

Change-Id: I2e52c0c27b049b8af8af205b7d6d497139bc071a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1838529
Commit-Queue: Johann Koenig <johannkoenig@google.com>
Reviewed-by: James Zern <jzern@google.com>
Cr-Commit-Position: refs/heads/master@{#703095}

third_party/libvpx/generate_gni.sh

@@ -56,9 +56,6 @@ done
 # $1 - Output base name
 function write_license {
   echo "# This file is generated. Do not edit." >> $1
-  echo "# Copyright (c) 2014 The Chromium Authors. All rights reserved." >> $1
-  echo "# Use of this source code is governed by a BSD-style license that can be" >> $1
-  echo "# found in the LICENSE file." >> $1
   echo "" >> $1
 }
 

third_party/libvpx/libvpx_srcs.gni

 # This file is generated. Do not edit.
-# Copyright (c) 2014 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.
 
 libvpx_srcs_x86 = [
   "//third_party/libvpx/source/libvpx/vp8/common/alloccommon.c",