Replace scoped_ptr with std::unique_ptr in //ui

ui/views/button_drag_utils.cc

 // 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.
 
 #include "ui/views/button_drag_utils.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/base/dragdrop/drag_utils.h"
 #include "ui/base/dragdrop/os_exchange_data.h"
 #include "ui/base/resource/resource_bundle.h"
@@ skipping 63 matching lines @@
   gfx::Size prefsize = button.GetPreferredSize();
   button.SetBounds(0, 0, prefsize.width(), prefsize.height());
 
   gfx::Vector2d press_point;
   if (press_pt)
     press_point = press_pt->OffsetFromOrigin();
   else
     press_point = gfx::Vector2d(prefsize.width() / 2, prefsize.height() / 2);
 
   // Render the image.
-  scoped_ptr<gfx::Canvas> canvas(
+  std::unique_ptr<gfx::Canvas> canvas(
       views::GetCanvasForDragImage(widget, prefsize));
   button.Paint(ui::CanvasPainter(canvas.get(), 1.f).context());
   drag_utils::SetDragImageOnDataObject(*canvas, press_point, data);
 }
 
 }  // namespace button_drag_utils