Drop ImageLoader::sourceURI

Source/core/html/HTMLImageLoader.cpp

Index: Source/core/html/HTMLImageLoader.cpp
diff --git a/Source/core/html/HTMLImageLoader.cpp b/Source/core/html/HTMLImageLoader.cpp
index a031bebb230814794a451fb27bdfecd2d96b579e..f4e9ca62a16f05b4a453c3137daed08643d55ce2 100644
--- a/Source/core/html/HTMLImageLoader.cpp
+++ b/Source/core/html/HTMLImageLoader.cpp
@@ -60,11 +60,6 @@ void HTMLImageLoader::dispatchLoadEvent()
     element()->dispatchEvent(Event::create(errorOccurred ? EventTypeNames::error : EventTypeNames::load));
 }
 
-String HTMLImageLoader::sourceURI(const AtomicString& attr) const
-{
-    return stripLeadingAndTrailingHTMLSpaces(attr);
-}
-
 static void loadFallbackContentForElement(Element* element)
 {
     if (isHTMLImageElement(element))