Move the CustomElementDefinition from ElementRareData to Element.

sky/engine/core/dom/Element.cpp

Index: sky/engine/core/dom/Element.cpp
diff --git a/sky/engine/core/dom/Element.cpp b/sky/engine/core/dom/Element.cpp
index 70c4676387b3f0d3ba15489807b3a87d9dcdc472..0815b4c8dfca466ae6d76da7504b7d93ee334cef 100644
--- a/sky/engine/core/dom/Element.cpp
+++ b/sky/engine/core/dom/Element.cpp
@@ -1025,17 +1025,13 @@ void Element::setNeedsAnimationStyleRecalc()
 
 void Element::setCustomElementDefinition(PassRefPtr<CustomElementDefinition> definition)
 {
-    if (!hasRareData() && !definition)
-        return;
-    ASSERT(!customElementDefinition());
-    ensureElementRareData().setCustomElementDefinition(definition);
+    ASSERT(!m_customElementDefinition);
+    m_customElementDefinition = definition;
 }
 
 CustomElementDefinition* Element::customElementDefinition() const
 {
-    if (hasRareData())
-        return elementRareData()->customElementDefinition();
-    return 0;
+    return m_customElementDefinition.get();
 }
 
 // TODO(esprehn): Implement the sky spec where shadow roots are a custom