Remove Cairo support.

Source/WebCore/platform/DragImage.h

 /*
  * Copyright (C) 2007 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 26 matching lines @@
 #elif PLATFORM(QT)
 QT_BEGIN_NAMESPACE
 class QPixmap;
 QT_END_NAMESPACE
 #elif PLATFORM(WIN)
 typedef struct HBITMAP__* HBITMAP;
 #elif PLATFORM(WX)
 class wxDragImage;
 #elif PLATFORM(CHROMIUM)
 #include "DragImageRef.h"
-#elif PLATFORM(GTK)
-typedef struct _cairo_surface cairo_surface_t;
 #endif
 
 //We need to #define YOffset as it needs to be shared with WebKit
 #define DragLabelBorderYOffset 2
 
 namespace WebCore {
     
     class CachedImage;
     class Frame;
     class Image;
     class KURL;
     class Range;
 
 #if PLATFORM(MAC)
     typedef RetainPtr<NSImage> DragImageRef;
 #elif PLATFORM(QT)
     typedef QPixmap* DragImageRef;
 #elif PLATFORM(WIN)
     typedef HBITMAP DragImageRef;
 #elif PLATFORM(WX)
     typedef wxDragImage* DragImageRef;
-#elif PLATFORM(GTK)
-    typedef cairo_surface_t* DragImageRef;
 #elif PLATFORM(EFL) || PLATFORM(BLACKBERRY)
     typedef void* DragImageRef;
 #endif
     
     IntSize dragImageSize(DragImageRef);
     
     //These functions should be memory neutral, eg. if they return a newly allocated image, 
     //they should release the input image.  As a corollary these methods don't guarantee
     //the input image ref will still be valid after they have been called
     DragImageRef fitDragImageToMaxSize(DragImageRef image, const IntSize& srcSize, const IntSize& size);
     DragImageRef scaleDragImage(DragImageRef, FloatSize scale);
     DragImageRef dissolveDragImageToFraction(DragImageRef image, float delta);
     
     DragImageRef createDragImageFromImage(Image*, RespectImageOrientationEnum = DoNotRespectImageOrientation);
     DragImageRef createDragImageForSelection(Frame*);    
     DragImageRef createDragImageIconForCachedImage(CachedImage*);
     DragImageRef createDragImageForLink(KURL&, const String& label, Frame*);
     void deleteDragImage(DragImageRef);
 }
 
 
 #endif //!DragImage_h