Use printer id to populate CUPS instead of printer name.

chrome/browser/chromeos/printing/printer_pref_manager.cc

 // Copyright 2016 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.
 
 #include "chrome/browser/chromeos/printing/printer_pref_manager.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 82 matching lines @@
   }
 
   return printers;
 }
 
 void PrinterPrefManager::RegisterPrinter(std::unique_ptr<Printer> printer) {
   if (printer->id().empty())
     printer->set_id(base::GenerateGUID());
 
   std::unique_ptr<base::DictionaryValue> updated_printer =
-      printing::PrinterToPref(*(printer.get()));
+      printing::PrinterToPref(*printer);
   UpdatePrinterPref(profile_, printer->id(), std::move(updated_printer));
 }
 
 bool PrinterPrefManager::RemovePrinter(const std::string& printer_id) {
   DCHECK(!printer_id.empty());
   ListPrefUpdate update(profile_->GetPrefs(), prefs::kPrintingDevices);
   base::ListValue* printer_list = update.Get();
   DCHECK(printer_list) << "Printer preference not registered";
   base::DictionaryValue* printer = FindPrinterPref(printer_list, printer_id);
 
   return printer && printer_list->Remove(*printer, nullptr);
 }
 
 }  // namespace chromeos