Use SkXfermode::Mode in code related to Image.

Source/platform/DragImageTest.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 72 matching lines @@
     // Stub implementations of pure virtual Image functions.
     virtual void destroyDecodedData(bool) override
     {
     }
 
     virtual bool currentFrameKnownToBeOpaque() override
     {
         return false;
     }
 
-    void draw(GraphicsContext*, const FloatRect&, const FloatRect&, CompositeOperator, WebBlendMode, RespectImageOrientationEnum) override
+    void draw(GraphicsContext*, const FloatRect&, const FloatRect&, SkXfermode::Mode, RespectImageOrientationEnum) override
     {
     }
 
 private:
 
     IntSize m_size;
 
     RefPtr<NativeImageSkia> m_nativeImage;
 };
 
@@ skipping 55 matching lines @@
 
     OwnPtr<DragImage> testImage =
         DragImage::create(url, testLabel, fontDescription, deviceScaleFactor);
     OwnPtr<DragImage> expectedImage =
         DragImage::create(url, expectedLabel, fontDescription, deviceScaleFactor);
 
     EXPECT_EQ(testImage->size().width(), expectedImage->size().width());
 }
 
 } // anonymous namespace