Do not reshow the text message after navigating to the next video.

ui/file_manager/video_player/js/media_controls.js

 // Copyright (c) 2012 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.
 
 'use strict';
 
 /**
  * @fileoverview MediaControls class implements media playback controls
  * that exist outside of the audio/video HTML element.
  */
@@ skipping 343 matching lines @@
  */
 MediaControls.prototype.attachMedia = function(mediaElement) {
   this.media_ = mediaElement;
 
   this.media_.addEventListener('play', this.onMediaPlayBound_);
   this.media_.addEventListener('pause', this.onMediaPauseBound_);
   this.media_.addEventListener('durationchange', this.onMediaDurationBound_);
   this.media_.addEventListener('timeupdate', this.onMediaProgressBound_);
   this.media_.addEventListener('error', this.onMediaError_);
 
+  // If the text banner is being displayed, hide it immediately, since it is
+  // related to the previous media.
+  this.textBanner_.removeAttribute('visible');
+
   // Reflect the media state in the UI.
   this.onMediaDuration_();
   this.onMediaPlay_(this.isPlaying());
   this.onMediaProgress_();
   if (this.volume_) {
     /* Copy the user selected volume to the new media element. */
     this.savedVolume_ = this.media_.volume = this.volume_.getValue();
   }
 };
 
@@ skipping 881 matching lines @@
 AudioControls.prototype.onAdvanceClick_ = function(forward) {
   if (!forward &&
       (this.getMedia().currentTime > AudioControls.TRACK_RESTART_THRESHOLD)) {
     // We are far enough from the beginning of the current track.
     // Restart it instead of than skipping to the previous one.
     this.getMedia().currentTime = 0;
   } else {
     this.advanceTrack_(forward);
   }
 };