PDF: Add alt/option key to Go To Page keyboard shortcut

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 362 matching lines @@
       case 65:  // a key.
         if (e.ctrlKey || e.metaKey) {
           this.plugin_.postMessage({
             type: 'selectAll'
           });
           // Since we do selection ourselves.
           e.preventDefault();
         }
         return;
       case 71: // g key.
-        if (this.materialToolbar_ && (e.ctrlKey || e.metaKey)) {
+        if (this.materialToolbar_ && (e.ctrlKey || e.metaKey) && e.altKey) {
           this.toolbarManager_.showToolbars();
           this.materialToolbar_.selectPageNumber();
-          // To prevent the default "find text" behaviour in Chrome.
-          e.preventDefault();
         }
         return;
       case 219:  // left bracket.
         if (e.ctrlKey)
           this.rotateCounterClockwise_();
         return;
       case 221:  // right bracket.
         if (e.ctrlKey)
           this.rotateClockwise_();
         return;
@@ skipping 476 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_;
   }
 };