Make chromeos CUPS printing code namespaces consistent.

chrome/browser/chromeos/printing/ppd_provider_factory.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 CHROME_BROWSER_CHROMEOS_PRINTING_PPD_PROVIDER_FACTORY_H_
 #define CHROME_BROWSER_CHROMEOS_PRINTING_PPD_PROVIDER_FACTORY_H_
 
 #include "base/memory/ref_counted.h"
 
 class Profile;
 
 namespace chromeos {
-namespace printing {
 
 class PpdProvider;
 
-scoped_refptr<PpdProvider> CreateProvider(Profile* profile);
+scoped_refptr<PpdProvider> CreatePpdProvider(Profile* profile);
 
-}  // namespace printing
-}  // namsepace chromeos
+}  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_PRINTING_PPD_PROVIDER_FACTORY_H_