Update license in index.html (#8834)

diff --git a/packages/devtools_app/web/index.html b/packages/devtools_app/web/index.html
index 55fd1e0..7200b51 100644
--- a/packages/devtools_app/web/index.html
+++ b/packages/devtools_app/web/index.html

@@ -1,15 +1,10 @@
+<!DOCTYPE html>
+
 <!--
 Copyright 2025 The Flutter Authors
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file or at https://developers.google.com/open-source/licenses/bsd.
 -->
-<!DOCTYPE html>
-
-<!--
-  Copyright 2018 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.
--->
 
 <html>