Fix left/right keyboard scrolling in PDFs

chrome/browser/resources/pdf/pdf.js

Index: chrome/browser/resources/pdf/pdf.js
diff --git a/chrome/browser/resources/pdf/pdf.js b/chrome/browser/resources/pdf/pdf.js
index 3046b5bca30fa93b03edcdcd1283485d93e6c474..23d9bbed4d1c6e2d674267d5e3abfdd3fb74adc9 100644
--- a/chrome/browser/resources/pdf/pdf.js
+++ b/chrome/browser/resources/pdf/pdf.js
@@ -262,7 +262,7 @@ PDFViewer.prototype = {
       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();
@@ -281,7 +281,7 @@ PDFViewer.prototype = {
       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();