Convert //printing to use std::unique_ptr

printing/printing_context.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_H_
 #define PRINTING_PRINTING_CONTEXT_H_
 
+#include <memory>
 #include <string>
 
 #include "base/callback.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
 #include "printing/print_settings.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace printing {
 
@@ skipping 88 matching lines @@
   virtual void Cancel() = 0;
 
   // Releases the native printing context.
   virtual void ReleaseContext() = 0;
 
   // Returns the native context used to print.
   virtual gfx::NativeDrawingContext context() const = 0;
 
   // Creates an instance of this object. Implementers of this interface should
   // implement this method to create an object of their implementation.
-  static scoped_ptr<PrintingContext> Create(Delegate* delegate);
+  static std::unique_ptr<PrintingContext> Create(Delegate* delegate);
 
   void set_margin_type(MarginType type);
 
   const PrintSettings& settings() const {
     return settings_;
   }
 
  protected:
   explicit PrintingContext(Delegate* delegate);
 
@@ skipping 15 matching lines @@
   // Did the user cancel the print job.
   volatile bool abort_printing_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PrintingContext);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PRINTING_CONTEXT_H_