Fix left/right keyboard scrolling in PDFs

chrome/browser/resources/pdf/pdf.js

 // Copyright 2013 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.
 
 'use strict';
 
 /**
  * @return {number} Width of a scrollbar in pixels
  */
 function getScrollbarWidth() {
@@ skipping 244 matching lines @@
         return;
       case 33:  // Page up key.
         pageUpHandler();
         return;
       case 34:  // Page down key.
         pageDownHandler();
         return;
       case 37:  // Left arrow key.
         if (!(e.altKey || e.ctrlKey || e.metaKey || e.shiftKey)) {
           // Go to the previous page if there are no horizontal scrollbars.
-          if (!this.viewport_.documentHasScrollbars().x) {
+          if (!this.viewport_.documentHasScrollbars().horizontal) {
             this.viewport_.goToPage(this.viewport_.getMostVisiblePage() - 1);
             // Since we do the movement of the page.
             e.preventDefault();
           } else if (fromScriptingAPI) {
             position.x -= Viewport.SCROLL_INCREMENT;
             this.viewport.position = position;
           }
         }
         return;
       case 38:  // Up arrow key.
         if (fromScriptingAPI) {
           position.y -= Viewport.SCROLL_INCREMENT;
           this.viewport.position = position;
         }
         return;
       case 39:  // Right arrow key.
         if (!(e.altKey || e.ctrlKey || e.metaKey || e.shiftKey)) {
           // Go to the next page if there are no horizontal scrollbars.
-          if (!this.viewport_.documentHasScrollbars().x) {
+          if (!this.viewport_.documentHasScrollbars().horizontal) {
             this.viewport_.goToPage(this.viewport_.getMostVisiblePage() + 1);
             // Since we do the movement of the page.
             e.preventDefault();
           } else if (fromScriptingAPI) {
             position.x += Viewport.SCROLL_INCREMENT;
             this.viewport.position = position;
           }
         }
         return;
       case 40:  // Down arrow key.
@@ skipping 504 matching lines @@
    * Each bookmark is an Object containing a:
    * - title
    * - page (optional)
    * - array of children (themselves bookmarks)
    * @type {Array} the top-level bookmarks of the PDF.
    */
   get bookmarks() {
     return this.bookmarks_;
   }
 };