Convert //ash from scoped_ptr to std::unique_ptr

ash/drag_drop/drag_drop_controller.cc

Index: ash/drag_drop/drag_drop_controller.cc
diff --git a/ash/drag_drop/drag_drop_controller.cc b/ash/drag_drop/drag_drop_controller.cc
index 1ec53aaca33114af10dfaccd752d511f0891db47..e2c6e6a43ebdf1cc673b58d665136144af635e89 100644
--- a/ash/drag_drop/drag_drop_controller.cc
+++ b/ash/drag_drop/drag_drop_controller.cc
@@ -372,7 +372,7 @@ void DragDropController::OnMouseEvent(ui::MouseEvent* event) {
     event->StopPropagation();
     return;
   }
-  scoped_ptr<ui::LocatedEvent> translated_event(
+  std::unique_ptr<ui::LocatedEvent> translated_event(
       drag_drop_tracker_->ConvertEvent(translated_target, *event));
   switch (translated_event->type()) {
     case ui::ET_MOUSE_DRAGGED:
@@ -440,7 +440,7 @@ void DragDropController::OnGestureEvent(ui::GestureEvent* event) {
     event->SetHandled();
     return;
   }
-  scoped_ptr<ui::LocatedEvent> translated_event(
+  std::unique_ptr<ui::LocatedEvent> translated_event(
       drag_drop_tracker_->ConvertEvent(translated_target, touch_offset_event));
 
   switch (event->type()) {
@@ -567,7 +567,7 @@ void DragDropController::Cleanup() {
   drag_data_ = NULL;
   // Cleanup can be called again while deleting DragDropTracker, so delete
   // the pointer with a local variable to avoid double free.
-  scoped_ptr<ash::DragDropTracker> holder = std::move(drag_drop_tracker_);
+  std::unique_ptr<ash::DragDropTracker> holder = std::move(drag_drop_tracker_);
 }
 
 }  // namespace ash