Oilpan: Prepare to move ImageLoader and its subclasses to Oilpan heap.

Source/core/html/HTMLImageLoader.h

Index: Source/core/html/HTMLImageLoader.h
diff --git a/Source/core/html/HTMLImageLoader.h b/Source/core/html/HTMLImageLoader.h
index 71c5365dbe8642697a20f101a053bdae2eefa7df..b9b93b8f9bde673ceb176421257e0c54effee576 100644
--- a/Source/core/html/HTMLImageLoader.h
+++ b/Source/core/html/HTMLImageLoader.h
@@ -29,13 +29,19 @@ namespace WebCore {
 
 class HTMLImageLoader FINAL : public ImageLoader {
 public:
-    HTMLImageLoader(Element*);
+    static PassOwnPtrWillBeRawPtr<HTMLImageLoader> create(Element* element)
+    {
+        return adoptPtrWillBeNoop(new HTMLImageLoader(element));
+    }
     virtual ~HTMLImageLoader();
 
     virtual void dispatchLoadEvent() OVERRIDE;
     virtual String sourceURI(const AtomicString&) const OVERRIDE;
 
     virtual void notifyFinished(Resource*) OVERRIDE;
+
+private:
+    explicit HTMLImageLoader(Element*);
 };
 
 }