Update {virtual,override} to follow C++11 style in printing.

printing/pdf_metafile_skia.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_PDF_METAFILE_SKIA_H_
 #define PRINTING_PDF_METAFILE_SKIA_H_
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 35 matching lines @@
 
   uint32 GetDataSize() const override;
   bool GetData(void* dst_buffer, uint32 dst_buffer_size) const override;
 
   gfx::Rect GetPageBounds(unsigned int page_number) const override;
   unsigned int GetPageCount() const override;
 
   gfx::NativeDrawingContext context() const override;
 
 #if defined(OS_WIN)
-  virtual bool Playback(gfx::NativeDrawingContext hdc,
-                        const RECT* rect) const override;
-  virtual bool SafePlayback(gfx::NativeDrawingContext hdc) const override;
+  bool Playback(gfx::NativeDrawingContext hdc,
+                const RECT* rect) const override;
+  bool SafePlayback(gfx::NativeDrawingContext hdc) const override;
 #elif defined(OS_MACOSX)
   bool RenderPage(unsigned int page_number,
                   gfx::NativeDrawingContext context,
                   const CGRect rect,
                   const MacRenderPageParams& params) const override;
 #endif
 
   bool SaveTo(base::File* file) const override;
 
 #if defined(OS_CHROMEOS) || defined(OS_ANDROID)
@@ skipping 16 matching lines @@
 
  private:
   scoped_ptr<PdfMetafileSkiaData> data_;
 
   DISALLOW_COPY_AND_ASSIGN(PdfMetafileSkia);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PDF_METAFILE_SKIA_H_