Update copyright headers in third_party/g*/ and third_party/h*/

These files are used to import new versions of third-party code, to
integrate that code into Chromium, or are otherwise not from upstream.

The methodology used to generate this CL is documented in
https://crbug.com/1098010#c95.

No-Try: true
Bug: 1098010
Change-Id: If1390c0852204feb159c04e7c71b3dc32ad1da09
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3938304
Commit-Queue: Mark Mentovai <mark@chromium.org>
Auto-Submit: Avi Drissman <avi@chromium.org>
Owners-Override: Avi Drissman <avi@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1056006}
NOKEYCHECK=True
GitOrigin-RevId: 11792108ac3ec785de127b452599705add5835dd
diff --git a/BUILD.gn b/BUILD.gn
index 5c0897f..20a84ae 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1,4 +1,4 @@
-# Copyright 2019 The Chromium Authors. All rights reserved.
+# Copyright 2019 The Chromium Authors
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
diff --git a/buildconfig.gni b/buildconfig.gni
index 5dfe37a..301c5bd 100644
--- a/buildconfig.gni
+++ b/buildconfig.gni
@@ -1,4 +1,4 @@
-# Copyright 2019 The Chromium Authors. All rights reserved.
+# Copyright 2019 The Chromium Authors
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.