Convert //ash from scoped_ptr to std::unique_ptr

ash/wm/dock/docked_window_layout_manager.h

Index: ash/wm/dock/docked_window_layout_manager.h
diff --git a/ash/wm/dock/docked_window_layout_manager.h b/ash/wm/dock/docked_window_layout_manager.h
index 4de7b80a42ce09f3679fe1f2247d379cd76a7758..b1589bd7110a0fe7075187a23e3de42be684962e 100644
--- a/ash/wm/dock/docked_window_layout_manager.h
+++ b/ash/wm/dock/docked_window_layout_manager.h
@@ -5,6 +5,8 @@
 #ifndef ASH_WM_DOCK_DOCKED_WINDOW_LAYOUT_MANAGER_H_
 #define ASH_WM_DOCK_DOCKED_WINDOW_LAYOUT_MANAGER_H_
 
+#include <memory>
+
 #include "ash/ash_export.h"
 #include "ash/shelf/shelf_layout_manager_observer.h"
 #include "ash/shell_observer.h"
@@ -14,7 +16,6 @@
 #include "ash/wm/window_state_observer.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
 #include "base/time/time.h"
 #include "ui/aura/window.h"
@@ -319,10 +320,10 @@ class ASH_EXPORT DockedWindowLayoutManager
   base::Time last_action_time_;
 
   // Observes shelf for bounds changes.
-  scoped_ptr<ShelfWindowObserver> shelf_observer_;
+  std::unique_ptr<ShelfWindowObserver> shelf_observer_;
 
   // Widget used to paint a background for the docked area.
-  scoped_ptr<DockedBackgroundWidget> background_widget_;
+  std::unique_ptr<DockedBackgroundWidget> background_widget_;
 
   // Observers of dock bounds changes.
   base::ObserverList<DockedWindowLayoutManagerObserver> observer_list_;