Remove ImageSource::bytesDecodedToDetermineProperties() and fallout

Source/web/tests/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 65 matching lines @@
             return 0;
 
         return m_nativeImage;
     }
 
     // Stub implementations of pure virtual Image functions.
     virtual void destroyDecodedData(bool) OVERRIDE
     {
     }
 
-    virtual unsigned decodedSize() const OVERRIDE
-    {
-        return 0u;
-    }
-
     virtual bool currentFrameKnownToBeOpaque() OVERRIDE
     {
         return false;
     }
 
     virtual void draw(GraphicsContext*, const FloatRect&, const FloatRect&, CompositeOperator, BlendMode) OVERRIDE
     {
     }
 
 private:
@@ skipping 38 matching lines @@
         // Tests that the drag image is a deep copy.
         RefPtr<TestImage> testImage(TestImage::create(IntSize(1, 1)));
         OwnPtr<DragImage> dragImage = DragImage::create(testImage.get());
         ASSERT_TRUE(dragImage);
         SkAutoLockPixels lock1(dragImage->bitmap()), lock2(testImage->nativeImageForCurrentFrame()->bitmap());
         EXPECT_NE(dragImage->bitmap().getPixels(), testImage->nativeImageForCurrentFrame()->bitmap().getPixels());
     }
 }
 
 } // anonymous namespace