Convert //ash from scoped_ptr to std::unique_ptr

ash/wm/dock/docked_window_resizer.h

Index: ash/wm/dock/docked_window_resizer.h
diff --git a/ash/wm/dock/docked_window_resizer.h b/ash/wm/dock/docked_window_resizer.h
index ad0e02bf1b04797c6ebcd9999f055b0466124c3e..4093ae9f04ae5be26b087c785daee7f5d4a84208 100644
--- a/ash/wm/dock/docked_window_resizer.h
+++ b/ash/wm/dock/docked_window_resizer.h
@@ -5,11 +5,12 @@
 #ifndef ASH_WM_DOCK_DOCK_WINDOW_RESIZER_H_
 #define ASH_WM_DOCK_DOCK_WINDOW_RESIZER_H_
 
+#include <memory>
+
 #include "ash/wm/dock/dock_types.h"
 #include "ash/wm/window_resizer.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 
 namespace gfx {
@@ -75,7 +76,7 @@ class ASH_EXPORT DockedWindowResizer : public WindowResizer {
   gfx::Point last_location_;
 
   // Wraps a window resizer and adds detaching / reattaching during drags.
-  scoped_ptr<WindowResizer> next_window_resizer_;
+  std::unique_ptr<WindowResizer> next_window_resizer_;
 
   // Dock container window.
   DockedWindowLayoutManager* dock_layout_;