Make chromeos CUPS printing code namespaces consistent.

chromeos/printing/printer_translator.h

 // 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.
 
 #ifndef CHROMEOS_PRINTING_PRINTER_TRANSLATOR_H_
 #define CHROMEOS_PRINTING_PRINTER_TRANSLATOR_H_
 
 #include <memory>
 
 #include "chromeos/chromeos_export.h"
 #include "chromeos/printing/printer_configuration.h"
 
 namespace base {
 class DictionaryValue;
 class Time;
 }
 
 namespace chromeos {
-namespace printing {
 
 CHROMEOS_EXPORT extern const char kPrinterId[];
 
 // Returns a new printer populated with the fields from |pref|.  Processes
 // dictionaries from policy i.e. cPanel.
 CHROMEOS_EXPORT std::unique_ptr<Printer> RecommendedPrinterToPrinter(
     const base::DictionaryValue& pref,
     const base::Time& timestamp);
 
-}  // namespace printing
 }  // namespace chromeos
 
 #endif  // CHROMEOS_PRINTING_PRINTER_TRANSLATOR_H_