WebUI: For cr-dialog, handle Enter keys in paper-inputs.

chrome/browser/resources/settings/site_settings/edit_exception_dialog.js

 // Copyright 2017 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-edit-exception-dialog' is a component for editing a
  * site exception entry.
  */
 Polymer({
   is: 'settings-edit-exception-dialog',
@@ skipping 48 matching lines @@
           this.origin_,
           this.origin_,
           this.model.category,
           this.model.setting,
           this.model.incognito);
     }
 
     this.$.dialog.close();
   },
 
-  /**
-   * @param {!KeyboardEvent} e
-   * @private
-   */
-  onKeypress_: function(e) {
-    if (e.key == 'Enter' && !this.$.actionButton.disabled)
-      this.onActionButtonTap_();
-  },
-
   /** @private */
   validate_: function() {
     if (this.$$('paper-input').value.trim() == '') {
       this.invalid_ = true;
       return;
     }
 
     this.browserProxy_.isPatternValid(this.origin_).then(function(isValid) {
       this.invalid_ = !isValid;
     }.bind(this));
   },
 });