Fixing behavior of print button when canceling print to pdf

chrome/browser/resources/print_preview.js

 // Copyright (c) 2011 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.
 
 var localStrings = new LocalStrings();
 
 // The total page count of the previewed document regardless of which pages the
 // user has selected.
 var totalPageCount = -1;
 
@@ skipping 314 matching lines @@
   var deviceName = '';
   if (selectedPrinter >= 0)
     deviceName = printerList.options[selectedPrinter].value;
   return deviceName;
 }
 
 /**
  * Asks the browser to print the preview PDF based on current print settings.
  */
 function printFile() {
-  $('print-button').classList.add('loading');
-  $('cancel-button').classList.add('loading');
-  $('print-summary').innerHTML = localStrings.getString('printing');
-  removeEventListeners();
-
   if (getSelectedPrinterName() != PRINT_TO_PDF) {
+    $('print-button').classList.add('loading');
+    $('cancel-button').classList.add('loading');
+    $('print-summary').innerHTML = localStrings.getString('printing');
+    removeEventListeners();
     window.setTimeout(function() { chrome.send('print', [getSettingsJSON()]); },
                       1000);
   } else
     chrome.send('print', [getSettingsJSON()]);
 }
 
 /**
  * Asks the browser to generate a preview PDF based on current print settings.
  */
 function requestPrintPreview() {
@@ skipping 588 matching lines @@
   this.isLandscape = '';
 }
 
 /**
  * Takes a snapshot of the print settings.
  */
 PrintSettings.prototype.save = function() {
   this.deviceName = getSelectedPrinterName();
   this.isLandscape = isLandscape();
 }