chromium/components/browser_ui/styles/android/java/res/values-sw600dp/styles.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright 2022 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->

<resources>
    <style name="ModernToolbar" parent="Base.ModernToolbar">
        <item name="android:background">@null</item>
    </style>
</resources>