Convert //ash from scoped_ptr to std::unique_ptr

ash/wm/panels/panel_window_resizer.h

Index: ash/wm/panels/panel_window_resizer.h
diff --git a/ash/wm/panels/panel_window_resizer.h b/ash/wm/panels/panel_window_resizer.h
index a18319417c77b938c976f7f9a77f3da8ada19bc3..ed6feb92360b1e9b99a16b8fbba8ef137d5b0c73 100644
--- a/ash/wm/panels/panel_window_resizer.h
+++ b/ash/wm/panels/panel_window_resizer.h
@@ -5,6 +5,8 @@
 #ifndef ASH_WM_PANELS_PANEL_WINDOW_RESIZER_H_
 #define ASH_WM_PANELS_PANEL_WINDOW_RESIZER_H_
 
+#include <memory>
+
 #include "ash/wm/window_resizer.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
@@ -63,7 +65,7 @@ class ASH_EXPORT PanelWindowResizer : public WindowResizer {
 
   // Wraps a window resizer and adds panel detaching / reattaching and snapping
   // to launcher behavior during drags.
-  scoped_ptr<WindowResizer> next_window_resizer_;
+  std::unique_ptr<WindowResizer> next_window_resizer_;
 
   // Panel container window.
   aura::Window* panel_container_;