Clear need for animation style for forced styleForElement.

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 2607f8068404cfcac097b193fdb630258c627a04..13cefbed14b9c15855b29fdcdc9c874819db3201 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -1731,10 +1731,20 @@ void Element::setAnimationStyleChange(bool animationStyleChange)
 {
     if (animationStyleChange && document().inStyleRecalc())
         return;
+    if (!hasRareData())
+        return;
     if (ElementAnimations* elementAnimations = elementRareData()->elementAnimations())
         elementAnimations->setAnimationStyleChange(animationStyleChange);
 }
 
+void Element::clearAnimationStyleChange()
+{
+    if (!hasRareData())
+        return;
+    if (ElementAnimations* elementAnimations = elementRareData()->elementAnimations())
+        elementAnimations->setAnimationStyleChange(false);
+}
+
 void Element::setNeedsAnimationStyleRecalc()
 {
     if (styleChangeType() != NoStyleChange)