Assume 1 collated copy for print preview generation

chrome/browser/resources/print_preview/native_layer.js

Index: chrome/browser/resources/print_preview/native_layer.js
diff --git a/chrome/browser/resources/print_preview/native_layer.js b/chrome/browser/resources/print_preview/native_layer.js
index 7fc53facab09edae98570e83b7330901f663539e..5e87d9a8ba077b14d844b853e17d5cc144a4ee4c 100644
--- a/chrome/browser/resources/print_preview/native_layer.js
+++ b/chrome/browser/resources/print_preview/native_layer.js
@@ -244,8 +244,8 @@ cr.define('print_preview', function() {
         // preview, they still need to be included.
         'duplex': printTicketStore.duplex.getValue() ?
             NativeLayer.DuplexMode.LONG_EDGE : NativeLayer.DuplexMode.SIMPLEX,
-        'copies': printTicketStore.copies.getValueAsNumber(),
-        'collate': printTicketStore.collate.getValue(),
+        'copies': 1,
+        'collate': true,
         'shouldPrintBackgrounds': printTicketStore.cssBackground.getValue(),
         'shouldPrintSelectionOnly': printTicketStore.selectionOnly.getValue()
       };