remove memoryinstrumentation

Source/core/css/CSSInitialValue.cpp

Index: Source/core/css/CSSInitialValue.cpp
diff --git a/Source/core/css/CSSInitialValue.cpp b/Source/core/css/CSSInitialValue.cpp
index d5776f11c01ab389b303e6fbe958efb4283fc637..afc7bbb93fdd022e997e73b93d93165dc0be889e 100644
--- a/Source/core/css/CSSInitialValue.cpp
+++ b/Source/core/css/CSSInitialValue.cpp
@@ -21,7 +21,6 @@
 #include "config.h"
 #include "CSSInitialValue.h"
 
-#include "WebCoreMemoryInstrumentation.h"
 #include <wtf/text/WTFString.h>
 
 namespace WebCore {
@@ -31,9 +30,4 @@ String CSSInitialValue::customCssText() const
     return "initial";
 }
 
-void CSSInitialValue::reportDescendantMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
-{
-    MemoryClassInfo info(memoryObjectInfo, this, WebCoreMemoryTypes::CSS);
-}
-
 } // namespace WebCore