Make blink classes and structures in core/css fast-allocated

Source/core/css/CSSPropertyMetadata.h

Index: Source/core/css/CSSPropertyMetadata.h
diff --git a/Source/core/css/CSSPropertyMetadata.h b/Source/core/css/CSSPropertyMetadata.h
index cc5f02d906d0590d856f588117a6ec6a1889a48a..302b447ba7ee2883db12ef8b2ee09072b3dcbbc2 100644
--- a/Source/core/css/CSSPropertyMetadata.h
+++ b/Source/core/css/CSSPropertyMetadata.h
@@ -6,10 +6,12 @@
 #define CSSPropertyMetadata_h
 
 #include "core/CSSPropertyNames.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class CSSPropertyMetadata {
+    STATIC_ONLY(CSSPropertyMetadata);
 public:
     static bool isEnabledProperty(CSSPropertyID);
     static bool isInterpolableProperty(CSSPropertyID);