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

chrome/browser/resources/settings/certificate_manager_page/certificate_password_encryption_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 A dialog prompting the user to encrypt a personal certificate
  * before it is exported to disk.
  */
 Polymer({
   is: 'settings-certificate-password-encryption-dialog',
@@ skipping 40 matching lines @@
             function() {
               this.$.dialog.close();
             }.bind(this),
             /** @param {!CertificatesError} error */
             function(error) {
               this.$.dialog.close();
               this.fire('certificates-error', error);
             }.bind(this));
   },
 
-  /**
-   * @param {!KeyboardEvent} e
-   * @private
-   */
-  onKeypress_: function(e) {
-    if (e.key == 'Enter' && !this.$.ok.disabled)
-      this.onOkTap_();
-  },
-
   /** @private */
   validate_: function() {
     var isValid = this.password_ != '' &&
         this.password_ == this.confirmPassword_;
     this.$.ok.disabled = !isValid;
   },
 });