Move <svg:image> buffered-rendering management to SVGImagePainter

Source/core/rendering/svg/SVGRenderingContext.h

Index: Source/core/rendering/svg/SVGRenderingContext.h
diff --git a/Source/core/rendering/svg/SVGRenderingContext.h b/Source/core/rendering/svg/SVGRenderingContext.h
index 181f0c4280c8a1724c4f98078fd45838a2dd30ad..f2dd571d7ac529b15d592110260c4927f7146c79 100644
--- a/Source/core/rendering/svg/SVGRenderingContext.h
+++ b/Source/core/rendering/svg/SVGRenderingContext.h
@@ -25,15 +25,14 @@
 #ifndef SVGRenderingContext_h
 #define SVGRenderingContext_h
 
-#include "core/rendering/PaintInfo.h"
 #include "core/rendering/svg/RenderSVGResourceClipper.h"
-#include "platform/graphics/ImageBuffer.h"
 #include "platform/transforms/AffineTransform.h"
 
 namespace blink {
 
 class RenderObject;
 class FloatRect;
+struct PaintInfo;
 class RenderSVGResourceFilter;
 class RenderSVGResourceMasker;
 
@@ -86,9 +85,6 @@ public:
 
     static float calculateScreenFontSizeScalingFactor(const RenderObject*);
 
-    // Support for the buffered-rendering hint.
-    bool bufferForeground(OwnPtr<ImageBuffer>&);
-
 private:
     // To properly revert partially successful initializtions in the destructor, we record all successful steps.
     enum RenderingFlags {