Remove display-options-display-view-mirroring.

chrome/browser/resources/options/chromeos/display_options.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.
 
 cr.exportPath('options');
 
 /**
  * @typedef {{
  *   availableColorProfiles: Array<{profileId: number, name: string}>,
  *   colorProfile: number,
@@ skipping 725 matching lines @@
       // The width/height should be same as the first display:
       var width = Math.ceil(this.displays_[0].width * this.visualScale_);
       var height = Math.ceil(this.displays_[0].height * this.visualScale_);
 
       var numDisplays = Math.max(MIN_NUM_DISPLAYS, this.displays_.length);
 
       var totalWidth = width + numDisplays * MIRRORING_OFFSET_PIXELS;
       var totalHeight = height + numDisplays * MIRRORING_OFFSET_PIXELS;
 
       this.displaysView_.style.height = totalHeight + 'px';
-      this.displaysView_.classList.add(
-          'display-options-displays-view-mirroring');
 
       // The displays should be centered.
       var offsetX =
           $('display-options-displays-view').offsetWidth / 2 - totalWidth / 2;
 
       for (var i = 0; i < numDisplays; i++) {
         var div = document.createElement('div');
         div.className = 'displays-display';
         div.style.top = i * MIRRORING_OFFSET_PIXELS + 'px';
         div.style.left = i * MIRRORING_OFFSET_PIXELS + offsetX + 'px';
@@ skipping 198 matching lines @@
       mirroring, displays, layout, offset) {
     DisplayOptions.getInstance().onDisplayChanged_(
         mirroring, displays, layout, offset);
   };
 
   // Export
   return {
     DisplayOptions: DisplayOptions
   };
 });