Present the printer list from preferences for Chrome OS.

chrome/browser/ui/webui/print_preview/print_preview_handler.h

Index: chrome/browser/ui/webui/print_preview/print_preview_handler.h
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_handler.h b/chrome/browser/ui/webui/print_preview/print_preview_handler.h
index b9e19d05f499930d2a2cc97b5b976e052317b8f5..30ceb8fc14efca6d26a1b5d6c809e61ea6b118ad 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_handler.h
+++ b/chrome/browser/ui/webui/print_preview/print_preview_handler.h
@@ -16,6 +16,7 @@
 #include "chrome/common/features.h"
 #include "components/signin/core/browser/gaia_cookie_manager_service.h"
 #include "content/public/browser/web_ui_message_handler.h"
+#include "printing/backend/print_backend.h"
 #include "printing/features/features.h"
 #include "ui/shell_dialogs/select_file_dialog.h"
 
@@ -214,7 +215,7 @@ class PrintPreviewHandler
       std::unique_ptr<base::DictionaryValue> settings_info);
 
   // Send the list of printers to the Web UI.
-  void SetupPrinterList(const base::ListValue* printers);
+  void SetupPrinterList(const printing::PrinterList& printer_list);
 
   // Send whether cloud print integration should be enabled.
   void SendCloudPrintEnabled();