convert //mash to std::unique_ptr

mash/wm/frame/caption_buttons/frame_caption_button.h

 // Copyright 2015 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 MASH_WM_FRAME_CAPTION_BUTTONS_FRAME_CAPTION_BUTTON_H_
 #define MASH_WM_FRAME_CAPTION_BUTTONS_FRAME_CAPTION_BUTTON_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "mash/wm/frame/caption_buttons/caption_button_types.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/views/controls/button/custom_button.h"
 
 namespace gfx {
 class SlideAnimation;
 }
 
 namespace mash {
 namespace wm {
@@ skipping 64 matching lines @@
   int pressed_background_image_id_;
   gfx::ImageSkia icon_image_;
   gfx::ImageSkia hovered_background_image_;
   gfx::ImageSkia pressed_background_image_;
 
   // The icon image to crossfade from.
   gfx::ImageSkia crossfade_icon_image_;
 
   // Crossfade animation started when the button's images are changed by
   // SetImages().
-  scoped_ptr<gfx::SlideAnimation> swap_images_animation_;
+  std::unique_ptr<gfx::SlideAnimation> swap_images_animation_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameCaptionButton);
 };
 
 }  // namespace wm
 }  // namespace mash
 
 #endif  // MASH_WM_FRAME_CAPTION_BUTTONS_FRAME_CAPTION_BUTTON_H_