Remove ::shadow and /deep/ combinator from Files app.

ui/file_manager/audio_player/elements/control_panel.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. */
 
 /* Controls bar. */
 .controls {
   align-items: center;
   background-color: white;
   display: flex;
   flex-direction: column;
@@ skipping 14 matching lines @@
   align-items: center;
   display: flex;
   flex-direction: row;
   justify-content: center;
   padding: 0;
 }
 
 /* Customized scrollbar for the playlist. */
 
 .media-button {
+  --files-toggle-ripple-activated: {
+    opacity: 0.1;
+  };
   background-color: transparent;
   border: 0;
   flex: none;
   height: 32px;
   outline: none;  /* TODO(yoshiki): Show outline only on keyboard focus. */
   padding: 0;
   position: relative;
   width: 32px;
 }
 
@@ skipping 161 matching lines @@
 /* Invisible div used to compute the width required for the elapsed time. */
 .time-controls > .time > .current {
   align-items: center;
   display: flex;
   flex-direction: row;
   height: 100%;
   justify-content: flex-end;
   position: absolute;
   top: -1px;
 }