Remove the composite attribute on <img>

Source/core/html/HTMLImageElement.h

Index: Source/core/html/HTMLImageElement.h
diff --git a/Source/core/html/HTMLImageElement.h b/Source/core/html/HTMLImageElement.h
index ad574f53c9faca47c986762202a4bcf62c937eba..1fceb3d75797573aed9677d44a935dc4aaa4340f 100644
--- a/Source/core/html/HTMLImageElement.h
+++ b/Source/core/html/HTMLImageElement.h
@@ -58,8 +58,6 @@ public:
 
     const AtomicString& altText() const;
 
-    CompositeOperator compositeOperator() const { return m_compositeOperator; }
-
     ImageResource* cachedImage() const { return imageLoader().image(); }
     void setImageResource(ImageResource* i) { imageLoader().setImage(i); };
 
@@ -142,7 +140,6 @@ private:
 #else
     WeakPtr<HTMLFormElement> m_form;
 #endif
-    CompositeOperator m_compositeOperator;
     AtomicString m_bestFitImageURL;
     float m_imageDevicePixelRatio;
     unsigned m_formWasSetByParser : 1;