Remove ContentData.

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 41f7deb97a9981b4cb97c128025d03ec823e9c9c..fb0280deab5b733510e42b46c73899ab411d10c6 100644
--- a/sky/engine/core/rendering/RenderImage.h
+++ b/sky/engine/core/rendering/RenderImage.h
@@ -50,10 +50,6 @@ public:
 
     void highQualityRepaintTimerFired(Timer<RenderImage>*);
 
-    void setIsGeneratedContent(bool generated = true) { m_isGeneratedContent = generated; }
-
-    bool isGeneratedContent() const { return m_isGeneratedContent; }
-
     String altText() const { return m_altText; }
 
     inline void setImageDevicePixelRatio(float factor) { m_imageDevicePixelRatio = factor; }
@@ -105,7 +101,6 @@ private:
     // Text to display as long as the image isn't available.
     String m_altText;
     OwnPtr<RenderImageResource> m_imageResource;
-    bool m_isGeneratedContent;
     float m_imageDevicePixelRatio;
 
     friend class RenderImageScaleObserver;