Convert //ash from scoped_ptr to std::unique_ptr

ash/frame/caption_buttons/frame_caption_button.h

Index: ash/frame/caption_buttons/frame_caption_button.h
diff --git a/ash/frame/caption_buttons/frame_caption_button.h b/ash/frame/caption_buttons/frame_caption_button.h
index f2132da38bb61ae0b9c777d43739fd558a1043fd..3a85cd79119412906a7c94f426b9d5d62f0b4562 100644
--- a/ash/frame/caption_buttons/frame_caption_button.h
+++ b/ash/frame/caption_buttons/frame_caption_button.h
@@ -5,10 +5,11 @@
 #ifndef ASH_FRAME_CAPTION_BUTTONS_FRAME_CAPTION_BUTTON_H_
 #define ASH_FRAME_CAPTION_BUTTONS_FRAME_CAPTION_BUTTON_H_
 
+#include <memory>
+
 #include "ash/ash_export.h"
 #include "ash/frame/caption_buttons/caption_button_types.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/views/controls/button/custom_button.h"
 
@@ -102,7 +103,7 @@ class ASH_EXPORT FrameCaptionButton : public views::CustomButton {
 
   // Crossfade animation started when the button's images are changed by
   // SetImage().
-  scoped_ptr<gfx::SlideAnimation> swap_images_animation_;
+  std::unique_ptr<gfx::SlideAnimation> swap_images_animation_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameCaptionButton);
 };