Revert of AudioPlayer: Update volume controls.

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;
   height: 96px;
   justify-content: center;
   padding: 0;
 }
 
-:host([volume-slider-shown]) .controls {
-  height: 144px;
-}
-
-.controls .control-row {
+.controls .upper-controls,
+.controls .lower-controls {
   box-sizing: border-box;
   height: 48px;
   padding: 8px;
   width: 100%;
 }
 
 .audio-controls {
   align-items: center;
   display: flex;
   flex-direction: row;
@@ skipping 68 matching lines @@
 }
 
 .time-container > .time.disabled {
   opacity: 0;
 }
 
 .time-container > .time-spacer {
   opacity: 0; /* This class is intended to be used as invisible spacer. */
 }
 
-paper-slider {
+.time-controls > paper-slider {
   --paper-slider-active-color: rgb(66, 133, 244);
   --paper-slider-knob-color: rgb(64, 138, 241);
   flex: auto;
 }
 
 .media-button.disabled,
 paper-slider.disabled {
   pointer-events: none;
 }
 
@@ skipping 114 matching lines @@
 .time-controls > .time > .current {
   align-items: center;
   display: flex;
   flex-direction: row;
   height: 100%;
   justify-content: flex-end;
   position: absolute;
   top: -1px;
 }
 
-.volume-controls {
-  align-items: center;
-  background-color: rgb(235, 235, 235);
-  display: flex;
-  flex-direction: row;
+/* Volume controls: sound button and volume slider */
+
+#volumeContainer {
+  border: 1px solid #ddd;
+  border-radius: 2px;
+  box-shadow: 0 2px 4px #777;
+  height: 110px;
+  position: fixed;
+  width: 32px;
 }
 
-.volume-controls paper-slider {
-  width: 100%;
+#volumeContainer.default-hidden {
+  visibility: hidden;
 }