Standardize usage of virtual/override/final in printing/

printing/metafile.h

 // Copyright (c) 2012 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 PRINTING_METAFILE_H_
 #define PRINTING_METAFILE_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 81 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MetafilePlayer);
 };
 
 // This class creates a graphics context that renders into a data stream
 // (usually PDF or EMF).
 class PRINTING_EXPORT Metafile : public MetafilePlayer {
  public:
   Metafile();
-  virtual ~Metafile();
+  ~Metafile() override;
 
   // Initializes a fresh new metafile for rendering. Returns false on failure.
   // Note: It should only be called from within the renderer process to allocate
   // rendering resources.
   virtual bool Init() = 0;
 
   // Initializes the metafile with the data in |src_buffer|. Returns true
   // on success.
   // Note: It should only be called from within the browser process.
   virtual bool InitFromData(const void* src_buffer, uint32 src_buffer_size) = 0;
@@ skipping 43 matching lines @@
   // Note: Windows has been known to have stack buffer overflow in its GDI
   // functions, whether used directly or indirectly through precompiled EMF
   // data. We have to accept the risk here. Since it is used only for printing,
   // it requires user intervention.
   virtual bool Playback(gfx::NativeDrawingContext hdc,
                         const RECT* rect) const = 0;
 #endif  // OS_WIN
 
   bool GetDataAsVector(std::vector<char>* buffer) const;
 
-  virtual bool SaveTo(base::File* file) const override;
+  bool SaveTo(base::File* file) const override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Metafile);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_METAFILE_H_