Update license boilerplate text in source code files

Normally we don't do this, but enough changes have accumulated that
we're doing a tree-wide one-off update of the name & style.

BUG=chromium:1098010
TEST=`repo upload` works

Change-Id: I099e56439df5ee9347df3bd5bca6fd1250d324b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform2/+/3889672
Owners-Override: Mike Frysinger <[email protected]>
Reviewed-by: Cindy Lin <[email protected]>
Tested-by: Mike Frysinger <[email protected]>
Tested-by: kokoro <[email protected]>
Reviewed-by: Byron Lee <[email protected]>
diff --git a/common-mk/check-mojom.py b/common-mk/check-mojom.py
index 61c672f..c17da52 100755
--- a/common-mk/check-mojom.py
+++ b/common-mk/check-mojom.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# Copyright 2021 The Chromium OS Authors. All rights reserved.
+# Copyright 2021 The ChromiumOS Authors
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.