Convert //printing to use std::unique_ptr

printing/printing_context_win.h

 // Copyright (c) 2011 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_PRINTING_CONTEXT_WIN_H_
 #define PRINTING_PRINTING_CONTEXT_WIN_H_
 
+#include <memory>
 #include <string>
 
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "printing/printing_context.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace printing {
 
 class PrintSettings;
 
 class PRINTING_EXPORT PrintingContextWin : public PrintingContext {
  public:
   explicit PrintingContextWin(Delegate* delegate);
@@ skipping 37 matching lines @@
 
   // The selected printer context.
   HDC context_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintingContextWin);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PRINTING_CONTEXT_WIN_H_