Make all LayerAnimationElement::Create*Element return unique_ptr

ui/wm/core/window_animations_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/wm/core/window_animations.h"
 
+#include <memory>
+
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "ui/aura/test/aura_test_base.h"
 #include "ui/aura/test/test_windows.h"
 #include "ui/aura/window.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/layer_animator.h"
 #include "ui/compositor/scoped_animation_duration_scale_mode.h"
 #include "ui/gfx/animation/animation_container_element.h"
 #include "ui/gfx/geometry/vector2d.h"
@@ skipping 302 matching lines @@
   wm::SetWindowVisibilityAnimationType(window.get(),
                                        WINDOW_VISIBILITY_ANIMATION_TYPE_ROTATE);
   AnimateOnChildWindowVisibilityChanged(window.get(), true);
   window->layer()->GetAnimator()->Step(base::TimeTicks::Now() +
                                        base::TimeDelta::FromSeconds(5));
   AnimateOnChildWindowVisibilityChanged(window.get(), false);
   animating_layer->GetAnimator()->StopAnimating();
 }
 
 }  // namespace wm