Make all LayerAnimationElement::Create*Element return unique_ptr

ui/compositor/layer_animator_unittest.cc

Index: ui/compositor/layer_animator_unittest.cc
diff --git a/ui/compositor/layer_animator_unittest.cc b/ui/compositor/layer_animator_unittest.cc
index 1d7f07482e0af2bdc347b1e14e3b8adbea97ef3b..41ebd846f756b6be35b0f69bf1968665f6cdd5db 100644
--- a/ui/compositor/layer_animator_unittest.cc
+++ b/ui/compositor/layer_animator_unittest.cc
@@ -44,12 +44,12 @@ std::string ColorToString(SkColor color) {
 // Creates vector with two LayerAnimationSequences, based on |first| and
 // |second| layer animation elements.
 std::vector<LayerAnimationSequence*> CreateMultiSequence(
-    LayerAnimationElement* first,
-    LayerAnimationElement* second) {
+    std::unique_ptr<LayerAnimationElement> first,
+    std::unique_ptr<LayerAnimationElement> second) {
   LayerAnimationSequence* first_sequence = new LayerAnimationSequence();
-  first_sequence->AddElement(first);
+  first_sequence->AddElement(std::move(first));
   LayerAnimationSequence* second_sequence = new LayerAnimationSequence();
-  second_sequence->AddElement(second);
+  second_sequence->AddElement(std::move(second));
 
   std::vector<ui::LayerAnimationSequence*> animations;
   animations.push_back(first_sequence);