Stop passing raw pointers to base::Value API in c/b/ui

chrome/browser/ui/webui/settings/chromeos/cups_printers_handler.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/ui/webui/settings/chromeos/cups_printers_handler.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 120 matching lines @@
     const base::ListValue* args) {
   AllowJavascript();
 
   CHECK_EQ(1U, args->GetSize());
   std::string callback_id;
   CHECK(args->GetString(0, &callback_id));
 
   std::vector<std::unique_ptr<Printer>> printers =
       PrintersManagerFactory::GetForBrowserContext(profile_)->GetPrinters();
 
-  base::ListValue* printers_list = new base::ListValue;
+  auto printers_list = base::MakeUnique<base::ListValue>();
   for (const std::unique_ptr<Printer>& printer : printers) {
     std::unique_ptr<base::DictionaryValue> printer_info =
         GetPrinterInfo(*printer.get());
     printers_list->Append(std::move(printer_info));
   }
 
-  std::unique_ptr<base::DictionaryValue> response =
-      base::MakeUnique<base::DictionaryValue>();
-  response->Set("printerList", printers_list);
+  auto response = base::MakeUnique<base::DictionaryValue>();
+  response->Set("printerList", std::move(printers_list));
   ResolveJavascriptCallback(base::Value(callback_id), *response);
 }
 
 void CupsPrintersHandler::HandleUpdateCupsPrinter(const base::ListValue* args) {
   std::string printer_id;
   std::string printer_name;
   CHECK(args->GetString(0, &printer_id));
   CHECK(args->GetString(1, &printer_name));
 
   std::unique_ptr<Printer> printer = base::MakeUnique<Printer>(printer_id);
@@ skipping 241 matching lines @@
                          base::Value("on-printer-discovered"), *printers_list);
 }
 
 void CupsPrintersHandler::OnDiscoveryInitialScanDone() {
   CallJavascriptFunction("cr.webUIListenerCallback",
                          base::Value("on-printer-discovery-done"));
 }
 
 }  // namespace settings
 }  // namespace chromeos