chromium/chrome/android/features/tab_ui/java/res/drawable/tab_list_editor_share_icon.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. -->

<vector xmlns:android="http://schemas.android.com/apk/res/android"
  android:width="24dp"
  android:height="24dp"
  android:viewportWidth="24"
  android:viewportHeight="24">
  <path
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    android:fillColor="@color/modern_grey_800"
    android:fillType="evenOdd"/>
</vector>