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: I208569250e49179362ec9e2343ffc13652f576dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/minijail/+/3893890
Tested-by: Mike Frysinger <[email protected]>
Commit-Queue: Allen Webb <[email protected]>
Auto-Submit: Mike Frysinger <[email protected]>
Reviewed-by: Allen Webb <[email protected]>
diff --git a/system.h b/system.h
index 11b7030..8889d9d 100644
--- a/system.h
+++ b/system.h
@@ -1,4 +1,4 @@
-/* Copyright 2017 The Chromium OS Authors. All rights reserved.
+/* Copyright 2017 The ChromiumOS Authors
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *