[WIP] do something :-)

Source/core/layout/line/RootInlineBox.cpp

Index: Source/core/layout/line/RootInlineBox.cpp
diff --git a/Source/core/layout/line/RootInlineBox.cpp b/Source/core/layout/line/RootInlineBox.cpp
index b4c3c2158c027f61bc6aa188e2413e03a27a0482..acfa4425d54cba6259655b5c53c0532e46e7319d 100644
--- a/Source/core/layout/line/RootInlineBox.cpp
+++ b/Source/core/layout/line/RootInlineBox.cpp
@@ -34,17 +34,12 @@
 #include "core/paint/PaintInfo.h"
 #include "core/paint/RootInlineBoxPainter.h"
 #include "platform/text/BidiResolver.h"
+#include "wtf/SizeAssertions.h"
 #include "wtf/text/Unicode.h"
 
 namespace blink {
 
-struct SameSizeAsRootInlineBox : public InlineFlowBox {
-    unsigned unsignedVariable;
-    void* pointers[3];
-    LayoutUnit layoutVariables[6];
-};
-
-static_assert(sizeof(RootInlineBox) == sizeof(SameSizeAsRootInlineBox), "RootInlineBox should stay small");
+ASSERT_SIZE(RootInlineBox, sizeof(InlineFlowBox) + 40, sizeof(InlineFlowBox) + 48);
 
 typedef WTF::HashMap<const RootInlineBox*, EllipsisBox*> EllipsisBoxMap;
 static EllipsisBoxMap* gEllipsisBoxMap = nullptr;