Make CSSAnimationUpdate stack-allocated

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index 43e4c1473d36db47b55150a09043360af952d63d..87577d888b1f7e18e3fad9a2b2f444a377cd9392 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -1589,7 +1589,7 @@ PassRefPtr<ComputedStyle> Element::styleForLayoutObject()
     // FIXME: Instead of clearing updates that may have been added from calls to styleForElement
     // outside recalcStyle, we should just never set them if we're not inside recalcStyle.
     if (ElementAnimations* elementAnimations = this->elementAnimations())
-        elementAnimations->cssAnimations().setPendingUpdate(nullptr);
+        elementAnimations->cssAnimations().clearPendingUpdate();
 
     if (hasCustomStyleCallbacks())
         style = customStyleForLayoutObject();