Avoid hardcoded font families.

ui/file_manager/audio_player/elements/track_list.css

 /* Copyright 2014 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. */
 
 :host {
   align-items: center;
   background: #f5f5f5;
   bottom: 72px;  /* Room for the controls bar. */
   color: #3d3d3d;
   cursor: default;
   display: flex;
   flex-direction: column;
-  font-family: Noto Sans UI, sans-serif;
   font-size: 10pt;
   justify-content: flex-start;
   left: 0;
   overflow-x: hidden;
   overflow-y: auto;
   position: absolute;
   right: 0;
   top: 0;
 }
 
@@ skipping 43 matching lines @@
 }
 
 .track .data .data-artist {
   color: #969696;
 }
 
 .track[active] .data .data-title,
 .track[active] .data .data-artist {
   color: #fff;
 }