[Video Player] Remove the default id of the video player

Setting the default id causes the regression crbug.com/450095, so this patch removes it.

BUG=450095
TEST=manually tested

Review URL: https://codereview.chromium.org/810483005

Cr-Commit-Position: refs/heads/master@{#312182}

ui/file_manager/video_player/js/background.js

@@ -17,7 +17,6 @@ var ICON_IMAGE = 'images/icon/video-player-64.png';
  * @type {Object}
  */
 var windowCreateOptions = {
-  id: 'video',
   frame: 'none',
   minWidth: 480,
   minHeight: 270