Fix document size not changing when switching between printers.

chrome/browser/resources/print_preview/preview_generator.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.
 
 cr.define('print_preview', function() {
   'use strict';
 
   /**
    * Interface to the Chromium print preview generator.
    * @param {!print_preview.DestinationStore} destinationStore Used to get the
@@ skipping 240 matching lines @@
           ticketStore.isFitToPageEnabled() != this.isFitToPageEnabled_ ||
           !ticketStore.getPageNumberSet().equals(this.pageNumberSet_) ||
           (ticketStore.getMarginsType() != this.marginsType_ &&
               ticketStore.getMarginsType() !=
                   print_preview.ticket_items.MarginsType.Value.CUSTOM) ||
           (ticketStore.getMarginsType() ==
               print_preview.ticket_items.MarginsType.Value.CUSTOM &&
               !ticketStore.getCustomMargins().equals(
                   ticketStore.getDocumentMargins())) ||
           (this.selectedDestination_ !=
-              this.destinationStore_.selectedDestination &&
-              (this.destinationStore_.selectedDestination.id ==
-                  print_preview.Destination.GooglePromotedId.SAVE_AS_PDF ||
-              this.selectedDestination_.id ==
-                  print_preview.Destination.GooglePromotedId.SAVE_AS_PDF));
+              this.destinationStore_.selectedDestination);
     },
 
     /**
      * Called when the page layout of the document is ready. Always occurs
      * as a result of a preview request.
      * @param {cr.Event} event Contains layout info about the document.
      * @private
      */
     onPageLayoutReady_: function(event) {
       // NOTE: A request ID is not specified, so assuming its for the current
@@ skipping 108 matching lines @@
       // current one.
       cr.dispatchSimpleEvent(this, PreviewGenerator.EventType.FAIL);
     }
   };
 
   // Export
   return {
     PreviewGenerator: PreviewGenerator
   };
 });