Drop ImageLoader::sourceURI

Source/core/html/HTMLImageLoader.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 42 matching lines @@
     // HTMLVideoElement uses this class to load the poster image, but it should not fire events for loading or failure.
     if (isHTMLVideoElement(*element()))
         return;
 
     bool errorOccurred = image()->errorOccurred();
     if (isHTMLObjectElement(*element()) && !errorOccurred)
         errorOccurred = (image()->response().httpStatusCode() >= 400); // An <object> considers a 404 to be an error and should fire onerror.
     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))
         toHTMLImageElement(element)->ensureFallbackContent();
     else if (isHTMLInputElement(element))
         toHTMLInputElement(element)->ensureFallbackContent();
 }
 
 void HTMLImageLoader::noImageResourceToLoad()
 {
@@ skipping 33 matching lines @@
         m_loadFallbackContentTimer.startOneShot(0, FROM_HERE);
     else
         loadFallbackContentForElement(element());
 }
 
 void HTMLImageLoader::timerFired(Timer<HTMLImageLoader>*)
 {
     loadFallbackContentForElement(element());
 }
 }