Convert //ash from scoped_ptr to std::unique_ptr

ash/wm/drag_window_resizer.h

Index: ash/wm/drag_window_resizer.h
diff --git a/ash/wm/drag_window_resizer.h b/ash/wm/drag_window_resizer.h
index ae23dbe15ba0a5532e629ac790899c24da7bcd9f..16acdc22cdef8dde2e99aad1ed739af42be6f97e 100644
--- a/ash/wm/drag_window_resizer.h
+++ b/ash/wm/drag_window_resizer.h
@@ -5,11 +5,12 @@
 #ifndef ASH_WM_DRAG_WINDOW_RESIZER_H_
 #define ASH_WM_DRAG_WINDOW_RESIZER_H_
 
+#include <memory>
+
 #include "ash/wm/window_resizer.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/gfx/geometry/point.h"
 
@@ -51,10 +52,10 @@ class ASH_EXPORT DragWindowResizer : public WindowResizer {
   // Returns true if we should allow the mouse pointer to warp.
   bool ShouldAllowMouseWarp();
 
-  scoped_ptr<WindowResizer> next_window_resizer_;
+  std::unique_ptr<WindowResizer> next_window_resizer_;
 
   // Shows a semi-transparent image of the window being dragged.
-  scoped_ptr<DragWindowController> drag_window_controller_;
+  std::unique_ptr<DragWindowController> drag_window_controller_;
 
   gfx::Point last_mouse_location_;