Teach HTMLImageElement that it doesn't need ::attach.

sky/engine/core/rendering/RenderImage.h

Index: sky/engine/core/rendering/RenderImage.h
diff --git a/sky/engine/core/rendering/RenderImage.h b/sky/engine/core/rendering/RenderImage.h
index 70400bbf390e0257b2cbd478565c7977c4a6986f..438d47ac72677bf976e3f483f627c9d3c68ec6c8 100644
--- a/sky/engine/core/rendering/RenderImage.h
+++ b/sky/engine/core/rendering/RenderImage.h
@@ -30,7 +30,7 @@
 
 namespace blink {
 
-class RenderImage : public RenderReplaced {
+class RenderImage final : public RenderReplaced {
 public:
     RenderImage(Element*);
     virtual ~RenderImage();
@@ -49,13 +49,9 @@ public:
     inline void setImageDevicePixelRatio(float factor) { m_imageDevicePixelRatio = factor; }
     float imageDevicePixelRatio() const { return m_imageDevicePixelRatio; }
 
-    virtual void intrinsicSizeChanged() override
-    {
-        if (m_imageResource)
-            imageChanged(m_imageResource->imagePtr());
-    }
+    virtual void intrinsicSizeChanged() override;
 
-protected:
+private:
     virtual bool needsPreferredWidthsRecalculation() const override final;
     virtual void computeIntrinsicRatioInformation(FloatSize& intrinsicSize, double& intrinsicRatio) const override final;
 
@@ -65,7 +61,6 @@ protected:
     virtual void paint(PaintInfo&, const LayoutPoint&) override final;
     virtual void layout() override;
 
-private:
     virtual const char* renderName() const override { return "RenderImage"; }
 
     virtual bool isImage() const override { return true; }
@@ -84,7 +79,7 @@ private:
     virtual bool boxShadowShouldBeAppliedToBackground(BackgroundBleedAvoidance, InlineFlowBox*) const override final;
 
     void paintInvalidationOrMarkForLayout(const IntRect* = 0);
-    void updateIntrinsicSizeIfNeeded(const LayoutSize&);
+    void updateIntrinsicSizeIfNeeded(const LayoutSize& newSize);
     // Update the size of the image to be rendered. Object-fit may cause this to be different from the CSS box's content rect.
     void updateInnerContentRect();