Remove image decoder down sampling

Source/core/platform/graphics/Image.cpp

Index: Source/core/platform/graphics/Image.cpp
diff --git a/Source/core/platform/graphics/Image.cpp b/Source/core/platform/graphics/Image.cpp
index 567b260105c5af29f95623969cd8fd699b71dca9..122f9bec54dbb26757f6f1e156ed4f08f25278a5 100644
--- a/Source/core/platform/graphics/Image.cpp
+++ b/Source/core/platform/graphics/Image.cpp
@@ -183,23 +183,6 @@ void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& dstRect, const Flo
     startAnimation();
 }
 
-#if ENABLE(IMAGE_DECODER_DOWN_SAMPLING)
-FloatRect Image::adjustSourceRectForDownSampling(const FloatRect& srcRect, const IntSize& scaledSize) const
-{
-    const IntSize unscaledSize = size();
-    if (unscaledSize == scaledSize)
-        return srcRect;
-
-    // Image has been down-sampled.
-    float xscale = static_cast<float>(scaledSize.width()) / unscaledSize.width();
-    float yscale = static_cast<float>(scaledSize.height()) / unscaledSize.height();
-    FloatRect scaledSrcRect = srcRect;
-    scaledSrcRect.scale(xscale, yscale);
-
-    return scaledSrcRect;
-}
-#endif
-
 void Image::computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio)
 {
     intrinsicRatio = size();