NOT FOR LANDING Experiment with allocating SVGImageForContainer on demand

Source/core/layout/LayoutImage.h

Index: Source/core/layout/LayoutImage.h
diff --git a/Source/core/layout/LayoutImage.h b/Source/core/layout/LayoutImage.h
index a4a2d8106711ec330b7eadb42471fdb745e2e78d..be4f60e2a3bca545842e88b9d46d991eba4c6d09 100644
--- a/Source/core/layout/LayoutImage.h
+++ b/Source/core/layout/LayoutImage.h
@@ -78,7 +78,6 @@ protected:
 
     void paint(const PaintInfo&, const LayoutPoint&) final;
 
-    void layout() override;
     bool updateImageLoadingPriorities() final;
 
     bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectLayoutImage || LayoutReplaced::isOfType(type); }
@@ -106,8 +105,6 @@ private:
 
     void invalidatePaintAndMarkForLayoutIfNeeded();
     void updateIntrinsicSizeIfNeeded(const LayoutSize&);
-    // 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();
 
     // Text to display as long as the image isn't available.
     OwnPtrWillBePersistent<LayoutImageResource> m_imageResource;