Removing a bunch of unused platform code.

Source/WebCore/platform/PlatformMenuDescription.h

 /*
  * Copyright (C) 2006 Apple Computer, 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 10 matching lines @@
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
  */
 
 #ifndef PlatformMenuDescription_h
 #define PlatformMenuDescription_h
 
 #if PLATFORM(MAC)
 OBJC_CLASS NSMutableArray;
-#elif PLATFORM(QT)
-#include <qlist.h>
-#elif PLATFORM(GTK)
-typedef struct _GtkMenu GtkMenu;
 #elif PLATFORM(CHROMIUM)
 #include <wtf/Vector.h>
 #endif
 
 namespace WebCore {
 
 #if !USE(CROSS_PLATFORM_CONTEXT_MENUS)
 #if PLATFORM(MAC)
     typedef NSMutableArray* PlatformMenuDescription;
-#elif PLATFORM(QT)
-    class ContextMenuItem;
-    typedef const QList<ContextMenuItem>* PlatformMenuDescription;
-#elif PLATFORM(GTK)
-    typedef GtkMenu* PlatformMenuDescription;
 #elif PLATFORM(CHROMIUM)
     class ContextMenuItem;
     typedef const Vector<ContextMenuItem>* PlatformMenuDescription;
 #else
     typedef void* PlatformMenuDescription;
 #endif
 #else
 // FIXME: When more platforms switch over, and PlatformMenuDescription
 // is not used anymore, we should rename this header to PlatformContextMenu.
 #if PLATFORM(WIN)
     typedef HMENU PlatformContextMenu;
     typedef MENUITEMINFO PlatformContextMenuItem;
 #else
     typedef void* PlatformContextMenu;
     typedef void* PlatformContextMenuItem;
 #endif
 #endif // !USE(CROSS_PLATFORM_CONTEXT_MENUS)
 
 } // namespace
 
 #endif // PlatformMenuDescription_h