remove memoryinstrumentation

Source/core/css/CSSImageSetValue.h

Index: Source/core/css/CSSImageSetValue.h
diff --git a/Source/core/css/CSSImageSetValue.h b/Source/core/css/CSSImageSetValue.h
index a791d1ea177fbf1c38b6eeb17349595b8f1c03d2..95270a67dfbd46bbd18a54bcba312d744008b9b7 100644
--- a/Source/core/css/CSSImageSetValue.h
+++ b/Source/core/css/CSSImageSetValue.h
@@ -58,15 +58,12 @@ public:
     struct ImageWithScale {
         String imageURL;
         float scaleFactor;
-        void reportMemoryUsage(MemoryObjectInfo*) const;
     };
 
     bool hasFailedOrCanceledSubresources() const;
 
     PassRefPtr<CSSImageSetValue> cloneForCSSOM() const;
 
-    void reportDescendantMemoryUsage(MemoryObjectInfo*) const;
-
 protected:
     ImageWithScale bestImageForScaleFactor();