Convert //ash from scoped_ptr to std::unique_ptr

ash/display/shared_display_edge_indicator.h

Index: ash/display/shared_display_edge_indicator.h
diff --git a/ash/display/shared_display_edge_indicator.h b/ash/display/shared_display_edge_indicator.h
index d08fd59cb38cd10a51d8d2072a868d0584285bf0..e9e30d7881a2dfdc37d9ddfad392518c2b9dc5b6 100644
--- a/ash/display/shared_display_edge_indicator.h
+++ b/ash/display/shared_display_edge_indicator.h
@@ -5,9 +5,10 @@
 #ifndef ASH_DISPLAY_SHARED_DISPLAY_EDGE_INDICATOR_H_
 #define ASH_DISPLAY_SHARED_DISPLAY_EDGE_INDICATOR_H_
 
+#include <memory>
+
 #include "ash/ash_export.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "ui/gfx/animation/animation_delegate.h"
 #include "ui/gfx/display.h"
 
@@ -47,7 +48,7 @@ class ASH_EXPORT SharedDisplayEdgeIndicator : public gfx::AnimationDelegate {
   views::View* dst_indicator_;
 
   // Used to transition the opacity.
-  scoped_ptr<gfx::ThrobAnimation> animation_;
+  std::unique_ptr<gfx::ThrobAnimation> animation_;
 
   DISALLOW_COPY_AND_ASSIGN(SharedDisplayEdgeIndicator);
 };