Make all LayerAnimationElement::Create*Element return unique_ptr

ash/rotator/screen_rotation_animation.cc

Index: ash/rotator/screen_rotation_animation.cc
diff --git a/ash/rotator/screen_rotation_animation.cc b/ash/rotator/screen_rotation_animation.cc
index 4e65e543181a9f6dd790be6da5ef46a933d9c11c..c0ac700237e75ca006ee17855ddce24d8ca127ea 100644
--- a/ash/rotator/screen_rotation_animation.cc
+++ b/ash/rotator/screen_rotation_animation.cc
@@ -28,15 +28,16 @@ ScreenRotationAnimation::ScreenRotationAnimation(ui::Layer* layer,
       tween_type_(tween_type),
       initial_opacity_(initial_opacity),
       target_opacity_(target_opacity) {
-  std::unique_ptr<ui::InterpolatedTransform> rotation(
-      new ui::InterpolatedTransformAboutPivot(
-          pivot, new ui::InterpolatedRotation(start_degrees, end_degrees)));
+  std::unique_ptr<ui::InterpolatedTransform> rotation =
+      base::MakeUnique<ui::InterpolatedTransformAboutPivot>(
+          pivot, base::MakeUnique<ui::InterpolatedRotation>(start_degrees,
+                                                            end_degrees));
 
   // Use the target transform/bounds in case the layer is already animating.
   gfx::Transform current_transform = layer->GetTargetTransform();
   interpolated_transform_.reset(
       new ui::InterpolatedConstantTransform(current_transform));
-  interpolated_transform_->SetChild(rotation.release());
+  interpolated_transform_->SetChild(std::move(rotation));
 }
 
 ScreenRotationAnimation::~ScreenRotationAnimation() {}