Migrate <cr-dialog> from PaperDialogBehavior to native <dialog>.

chrome/browser/resources/settings/device_page/display_overscan_dialog.js

 // Copyright 2016 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
  * 'settings-display-overscan-dialog' is the dialog for display overscan
  * adjustments.
  */
 
@@ skipping 25 matching lines @@
     window.addEventListener('keydown', this.keyHandler_);
   },
 
   /** @override */
   detached: function() {
     window.removeEventListener('keydown', this.keyHandler_);
   },
 
   open: function() {
     this.comitted_ = false;
-    this.$.dialog.open();
+    this.$.dialog.showModal();
   },
 
   close: function() {
     this.displayId = '';  // Will trigger displayIdChanged_.
-    this.$.dialog.close();
+
+    if (this.$.dialog.open)
+      this.$.dialog.close();
   },
 
   /** @private */
   displayIdChanged_: function(newValue, oldValue) {
     if (oldValue && !this.comitted_) {
       settings.display.systemDisplayApi.overscanCalibrationReset(oldValue);
       settings.display.systemDisplayApi.overscanCalibrationComplete(oldValue);
     }
     if (!newValue)
       return;
@@ skipping 75 matching lines @@
     /** @type {!chrome.system.display.Insets} */ var delta = {
       left: x,
       top: y,
       right: x,
       bottom: y,
     };
     settings.display.systemDisplayApi.overscanCalibrationAdjust(
         this.displayId, delta);
   }
 });