[WIP] do something :-)

Source/core/dom/ElementData.cpp

Index: Source/core/dom/ElementData.cpp
diff --git a/Source/core/dom/ElementData.cpp b/Source/core/dom/ElementData.cpp
index 0dd820cbabc7ff17279014603ea6c23fc90a7ff4..0c850d7354bac52f90a012da5dc8d9f80d1f82b6 100644
--- a/Source/core/dom/ElementData.cpp
+++ b/Source/core/dom/ElementData.cpp
@@ -33,16 +33,12 @@
 
 #include "core/css/StylePropertySet.h"
 #include "core/dom/QualifiedName.h"
+#include "wtf/SizeAssertions.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
-struct SameSizeAsElementData : public RefCountedWillBeGarbageCollectedFinalized<SameSizeAsElementData> {
-    unsigned bitfield;
-    void* pointers[3];
-};
-
-static_assert(sizeof(ElementData) == sizeof(SameSizeAsElementData), "ElementData should stay small");
+ASSERT_SIZE(ElementData, 20, 32);
 
 static size_t sizeForShareableElementDataWithAttributeCount(unsigned count)
 {