Print Preview: Change getPrinters to cr.sendWithPromise

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

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_HANDLER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 224 matching lines @@
       const std::string& printer_name,
       std::unique_ptr<base::DictionaryValue> settings_info);
 
   // Send the result of performing printer setup. |settings_info| contains
   // printer capabilities.
   void SendPrinterSetup(const std::string& callback_id,
                         const std::string& printer_name,
                         std::unique_ptr<base::DictionaryValue> settings_info);
 
   // Send the list of printers to the Web UI.
-  void SetupPrinterList(const printing::PrinterList& printer_list);
+  void SetupPrinterList(const std::string& callback_id,
+                        const printing::PrinterList& printer_list);
 
   // Send whether cloud print integration should be enabled.
   void SendCloudPrintEnabled();
 
   // Send the PDF data to the cloud to print.
   void SendCloudPrintJob(const base::RefCountedBytes* data);
 
   // Gets the initiator for the print preview dialog.
   content::WebContents* GetInitiator() const;
 
@@ skipping 145 matching lines @@
   // Proxy for calls to the print backend.  Lazily initialized since web_ui() is
   // not available at construction time.
   std::unique_ptr<printing::PrinterBackendProxy> printer_backend_proxy_;
 
   base::WeakPtrFactory<PrintPreviewHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_HANDLER_H_