Make chromeos CUPS printing code namespaces consistent.

chromeos/printing/ppd_provider.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_PPD_PROVIDER_H_
 #define CHROMEOS_PRINTING_PPD_PROVIDER_H_
 
 #include <map>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "chromeos/chromeos_export.h"
 #include "chromeos/printing/printer_configuration.h"
 
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace chromeos {
-namespace printing {
 
 class PpdCache;
 
 // PpdProvider is responsible for mapping printer descriptions to
 // CUPS-PostScript Printer Description (PPD) files.  It provides PPDs that a
 // user previously identified for use, and falls back to querying quirksserver
 // based on manufacturer/model of the printer.
 //
 // All functions in this class must be called from a sequenced context.
 class CHROMEOS_EXPORT PpdProvider : public base::RefCounted<PpdProvider> {
@@ skipping 96 matching lines @@
   //
   // |cb| will be called on the invoking thread, and will be sequenced.
   virtual void ResolvePpd(const Printer::PpdReference& reference,
                           const ResolvePpdCallback& cb) = 0;
 
  protected:
   friend class base::RefCounted<PpdProvider>;
   virtual ~PpdProvider() {}
 };
 
-}  // namespace printing
 }  // namespace chromeos
 
 #endif  // CHROMEOS_PRINTING_PPD_PROVIDER_H_