chrome/browser/share/android/java/res/drawable/generic_favicon.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2020 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. -->
<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:viewportWidth="24"
    android:viewportHeight="24">
  <group>
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    <path
        android:pathData="M0,0h24v24h-24z"
        android:strokeWidth="1"
        android:fillColor="@color/modern_grey_700"
        android:fillType="evenOdd"/>
  </group>
</vector>