Use SkXfermode::Mode in code related to Image.

Source/platform/graphics/GeneratedImage.cpp

Index: Source/platform/graphics/GeneratedImage.cpp
diff --git a/Source/platform/graphics/GeneratedImage.cpp b/Source/platform/graphics/GeneratedImage.cpp
index dede8992662ecddfb515c9e2b0cb9bd22749ede9..4dbfb8a987a4ebd523f6c7f73fce5c2c63480fcf 100644
--- a/Source/platform/graphics/GeneratedImage.cpp
+++ b/Source/platform/graphics/GeneratedImage.cpp
@@ -44,7 +44,7 @@ void GeneratedImage::computeIntrinsicDimensions(Length& intrinsicWidth, Length&
 }
 
 void GeneratedImage::drawPattern(GraphicsContext* destContext, const FloatRect& srcRect, const FloatSize& scale,
-    const FloatPoint& phase, CompositeOperator compositeOp, const FloatRect& destRect, WebBlendMode blendMode,
+    const FloatPoint& phase, SkXfermode::Mode compositeOp, const FloatRect& destRect,
     const IntSize& repeatSpacing)
 {
     FloatRect tileRect = srcRect;
@@ -64,7 +64,7 @@ void GeneratedImage::drawPattern(GraphicsContext* destContext, const FloatRect&
     picturePattern->setPatternSpaceTransform(patternTransform);
 
     GraphicsContextStateSaver saver(*destContext);
-    destContext->setCompositeOperation(WebCoreCompositeToSkiaComposite(compositeOp, blendMode));
+    destContext->setCompositeOperation(compositeOp);
     destContext->setFillPattern(picturePattern);
     destContext->fillRect(destRect);
 }