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

Source/core/html/HTMLCanvasElement.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 374 matching lines @@
 
     if (m_size.isEmpty() || !buffer())
         return String("data:,");
 
     String encodingMimeType = toEncodingMimeType(mimeType);
 
     // Try to get ImageData first, as that may avoid lossy conversions.
     RefPtr<ImageData> imageData = getImageData();
 
     if (imageData)
-        return ImageDataToDataURL(*imageData, encodingMimeType, quality);
+        return ImageDataToDataURL(ImageDataBuffer(imageData->size(), imageData->data()), encodingMimeType, quality);
 
     if (m_context)
         m_context->paintRenderingResultsToCanvas();
 
     return buffer()->toDataURL(encodingMimeType, quality);
 }
 
 PassRefPtr<ImageData> HTMLCanvasElement::getImageData()
 {
     if (!m_context || !m_context->is3d())
@@ skipping 146 matching lines @@
     ASSERT(m_hasCreatedImageBuffer);
     IntSize unscaledSize = size();
     IntSize size = convertLogicalToDevice(unscaledSize);
     AffineTransform transform;
     if (size.width() && size.height())
         transform.scaleNonUniform(size.width() / unscaledSize.width(), size.height() / unscaledSize.height());
     return m_imageBuffer->baseTransform() * transform;
 }
 
 }