Update copyright headers in gin/

The methodology used to generate this CL is documented in
https://crbug.com/1098010#c34.

No-Try: true
Bug: 1098010
Change-Id: Iafb266228260abedd345bc3e8c1d483c3a4dc4d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3891087
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@{#1046550}

diff --git a/gin/handle.h b/gin/handle.h
index 2be9ac6..d0fd583 100644
--- a/gin/handle.h
+++ b/gin/handle.h

@@ -1,4 +1,4 @@
-// Copyright 2013 The Chromium Authors. All rights reserved.
+// Copyright 2013 The Chromium Authors
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.