Print Preview: Fix top level directory compile errors

chrome/browser/resources/print_preview/previewarea/preview_area.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.
 
 /**
  * @typedef {{accessibility: Function,
  *            documentLoadComplete: Function,
  *            getHeight: Function,
  *            getHorizontalScrollbarThickness: Function,
  *            getPageLocationNormalized: Function,
@@ skipping 275 matching lines @@
 
       // No scroll bar anywhere, or the active element is something else, like a
       // button. Note: buttons have a bigger scrollHeight than clientHeight.
       this.plugin_.sendKeyEvent(e);
       e.preventDefault();
     },
 
     /**
      * Set a callback that gets called when a key event is received that
      * originates in the plugin.
-     * @param {function(Event)} callback The callback to be called with a key
-     *     event.
+     * @param {function(KeyboardEvent)} callback The callback to be called with
+     *     a key event.
      */
     setPluginKeyEventCallback: function(callback) {
       this.keyEventCallback_ = callback;
     },
 
     /**
      * Shows a custom message on the preview area's overlay.
      * @param {string} message Custom message to show.
      */
     showCustomMessage: function(message) {
@@ skipping 350 matching lines @@
       // being draggable.
       this.plugin_.style.pointerEvents = isDragging ? 'none' : 'auto';
     }
   };
 
   // Export
   return {
     PreviewArea: PreviewArea
   };
 });