Make all LayerAnimationElement::Create*Element return unique_ptr

ash/wm/session_state_animator_impl.cc

Index: ash/wm/session_state_animator_impl.cc
diff --git a/ash/wm/session_state_animator_impl.cc b/ash/wm/session_state_animator_impl.cc
index 783a2ba8c2f168c8a3b9879268042483943b2477..f75cf0eb6d05c836b8c89945bfefba2d9166bd88 100644
--- a/ash/wm/session_state_animator_impl.cc
+++ b/ash/wm/session_state_animator_impl.cc
@@ -254,20 +254,18 @@ void StartGrayscaleBrightnessAnimationForWindow(
     ui::LayerAnimationObserver* observer) {
   ui::LayerAnimator* animator = window->layer()->GetAnimator();
 
-  std::unique_ptr<ui::LayerAnimationSequence> brightness_sequence(
-      new ui::LayerAnimationSequence());
-  std::unique_ptr<ui::LayerAnimationSequence> grayscale_sequence(
-      new ui::LayerAnimationSequence());
+  auto brightness_sequence = base::MakeUnique<ui::LayerAnimationSequence>();
+  auto grayscale_sequence = base::MakeUnique<ui::LayerAnimationSequence>();
 
-  std::unique_ptr<ui::LayerAnimationElement> brightness_element(
-      ui::LayerAnimationElement::CreateBrightnessElement(target, duration));
+  std::unique_ptr<ui::LayerAnimationElement> brightness_element =
+      ui::LayerAnimationElement::CreateBrightnessElement(target, duration);
   brightness_element->set_tween_type(tween_type);
-  brightness_sequence->AddElement(brightness_element.release());
+  brightness_sequence->AddElement(std::move(brightness_element));
 
-  std::unique_ptr<ui::LayerAnimationElement> grayscale_element(
-      ui::LayerAnimationElement::CreateGrayscaleElement(target, duration));
+  std::unique_ptr<ui::LayerAnimationElement> grayscale_element =
+      ui::LayerAnimationElement::CreateGrayscaleElement(target, duration);
   grayscale_element->set_tween_type(tween_type);
-  grayscale_sequence->AddElement(grayscale_element.release());
+  grayscale_sequence->AddElement(std::move(grayscale_element));
 
   std::vector<ui::LayerAnimationSequence*> animations;
   animations.push_back(brightness_sequence.release());