Convert //ash from scoped_ptr to std::unique_ptr

ash/wm/toplevel_window_event_handler.h

Index: ash/wm/toplevel_window_event_handler.h
diff --git a/ash/wm/toplevel_window_event_handler.h b/ash/wm/toplevel_window_event_handler.h
index aa12f28f30fbb6a3f0c178839acd823056d56fb3..eef8c1e9f8e633e8d2336a561080a62b443b18ad 100644
--- a/ash/wm/toplevel_window_event_handler.h
+++ b/ash/wm/toplevel_window_event_handler.h
@@ -5,6 +5,7 @@
 #ifndef ASH_WM_TOPLEVEL_WINDOW_EVENT_HANDLER_H_
 #define ASH_WM_TOPLEVEL_WINDOW_EVENT_HANDLER_H_
 
+#include <memory>
 #include <set>
 
 #include "ash/ash_export.h"
@@ -13,7 +14,6 @@
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "ui/events/event_handler.h"
 #include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/rect.h"
@@ -119,7 +119,7 @@ class ASH_EXPORT ToplevelWindowEventHandler
   // Whether the drag was reverted. Set by CompleteDrag().
   bool drag_reverted_;
 
-  scoped_ptr<ScopedWindowResizer> window_resizer_;
+  std::unique_ptr<ScopedWindowResizer> window_resizer_;
 
   base::Closure quit_closure_;