Break dependency of platform/graphics on html/ImageData.h

Source/core/platform/image-encoders/skia/JPEGImageEncoder.h

 /*
  * 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 19 matching lines @@
 
 #ifndef JPEGImageEncoder_h
 #define JPEGImageEncoder_h
 
 #include "wtf/Vector.h"
 
 class SkBitmap;
 
 namespace WebCore {
 
-class ImageData;
+struct ImageDataBuffer;
 
 class JPEGImageEncoder {
 public:
     // Encode the input data with a compression quality in [0-100].
     static bool encode(const SkBitmap&, int quality, Vector<unsigned char>*);
-    static bool encode(const ImageData&, int quality, Vector<unsigned char>*);
+    static bool encode(const ImageDataBuffer&, int quality, Vector<unsigned char>*);
 
     // For callers: provide a reasonable compression quality default.
     enum Quality { DefaultCompressionQuality = 92 };
 };
 
 } // namespace WebCore
 
 #endif