Added ASSERT_SIZE macro for checking size of size-sensitive classes

third_party/WebKit/Source/core/css/CSSValue.cpp

Index: third_party/WebKit/Source/core/css/CSSValue.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSValue.cpp b/third_party/WebKit/Source/core/css/CSSValue.cpp
index f2b29069e1e6a998c5fdae8d84ade4a0b1600229..1a0266a78b209ebc49f1d4abe43e161d389eb17d 100644
--- a/third_party/WebKit/Source/core/css/CSSValue.cpp
+++ b/third_party/WebKit/Source/core/css/CSSValue.cpp
@@ -62,14 +62,14 @@
 #include "core/css/CSSValueList.h"
 #include "core/css/CSSValuePair.h"
 #include "core/css/CSSVariableReferenceValue.h"
+#include "wtf/SizeAssertions.h"
 
 namespace blink {
 
 struct SameSizeAsCSSValue : public GarbageCollectedFinalized<SameSizeAsCSSValue> {
     uint32_t bitfields;
 };
-
-static_assert(sizeof(CSSValue) <= sizeof(SameSizeAsCSSValue), "CSSValue should stay small");
+ASSERT_SIZE(CSSValue, SameSizeAsCSSValue);
 
 bool CSSValue::isImplicitInitialValue() const
 {