Convert //ash from scoped_ptr to std::unique_ptr

ash/rotator/window_rotation.cc

Index: ash/rotator/window_rotation.cc
diff --git a/ash/rotator/window_rotation.cc b/ash/rotator/window_rotation.cc
index b64477d976154d42429f5d3b1fa0c83c5192fd80..ad023b978dfdabb03d963e5055fd06d7575ac7ad 100644
--- a/ash/rotator/window_rotation.cc
+++ b/ash/rotator/window_rotation.cc
@@ -77,20 +77,20 @@ void WindowRotation::InitTransform(ui::Layer* layer) {
   current_transform.TransformPoint(&new_pivot);
   current_transform.TransformPoint(&new_origin_);
 
-  scoped_ptr<ui::InterpolatedTransform> rotation(
+  std::unique_ptr<ui::InterpolatedTransform> rotation(
       new ui::InterpolatedTransformAboutPivot(
           old_pivot, new ui::InterpolatedRotation(0, degrees_)));
 
-  scoped_ptr<ui::InterpolatedTransform> translation(
+  std::unique_ptr<ui::InterpolatedTransform> translation(
       new ui::InterpolatedTranslation(
           gfx::PointF(), gfx::PointF(new_pivot.x() - old_pivot.x(),
                                      new_pivot.y() - old_pivot.y())));
 
   float scale_factor = 0.9f;
-  scoped_ptr<ui::InterpolatedTransform> scale_down(
+  std::unique_ptr<ui::InterpolatedTransform> scale_down(
       new ui::InterpolatedScale(1.0f, scale_factor, 0.0f, 0.5f));
 
-  scoped_ptr<ui::InterpolatedTransform> scale_up(
+  std::unique_ptr<ui::InterpolatedTransform> scale_up(
       new ui::InterpolatedScale(1.0f, 1.0f / scale_factor, 0.5f, 1.0f));
 
   interpolated_transform_.reset(