[WIP] do something :-)

Source/core/css/StylePropertySet.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Research In Motion Limited. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 13 matching lines @@
 #include "core/css/StylePropertySet.h"
 
 #include "core/StylePropertyShorthand.h"
 #include "core/css/CSSPropertyMetadata.h"
 #include "core/css/CSSValuePool.h"
 #include "core/css/StylePropertySerializer.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/css/parser/CSSParser.h"
 #include "core/frame/UseCounter.h"
 #include "platform/RuntimeEnabledFeatures.h"
+#include "wtf/SizeAssertions.h"
 #include "wtf/text/StringBuilder.h"
 
 #ifndef NDEBUG
 #include "wtf/text/CString.h"
 #include <stdio.h>
 #endif
 
 namespace blink {
 
 static size_t sizeForImmutableStylePropertySetWithPropertyCount(unsigned count)
@@ skipping 445 matching lines @@
     StylePropertySet::traceAfterDispatch(visitor);
 }
 
 unsigned StylePropertySet::averageSizeInBytes()
 {
     // Please update this if the storage scheme changes so that this longer reflects the actual size.
     return sizeForImmutableStylePropertySetWithPropertyCount(4);
 }
 
 // See the function above if you need to update this.
-struct SameSizeAsStylePropertySet : public RefCountedWillBeGarbageCollectedFinalized<SameSizeAsStylePropertySet> {
-    unsigned bitfield;
-};
-static_assert(sizeof(StylePropertySet) == sizeof(SameSizeAsStylePropertySet), "StylePropertySet should stay small");
+ASSERT_SIZE(StylePropertySet, 8, 8);
 
 #ifndef NDEBUG
 void StylePropertySet::showStyle()
 {
     fprintf(stderr, "%s\n", asText().ascii().data());
 }
 #endif
 
 PassRefPtrWillBeRawPtr<MutableStylePropertySet> MutableStylePropertySet::create(CSSParserMode cssParserMode)
 {
     return adoptRefWillBeNoop(new MutableStylePropertySet(cssParserMode));
 }
 
 PassRefPtrWillBeRawPtr<MutableStylePropertySet> MutableStylePropertySet::create(const CSSProperty* properties, unsigned count)
 {
     return adoptRefWillBeNoop(new MutableStylePropertySet(properties, count));
 }
 
 } // namespace blink