Elim cr_elements/v1_0 subdirectory

ui/webui/resources/cr_elements/cr_collapse/cr_collapse.js

 // Copyright 2015 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.
 
 /**
  * @fileoverview
  * `cr-collapse` creates a collapsible block of content. By default, the content
  * will be collapsed. Use `opened` or `toggle()` to show/hide the content.
  * `cr-collapse` adjusts the height/width of the collapsible element to
  * show/hide the content. So avoid putting padding/margin/border on the
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       value: false,
       reflectToAttribute: true,
       notify: true
     },
   },
 
   toggle: function() {
     this.$.collapse.toggle();
   },
 });