Revert "Handle GTK enter and leave notification events and pass them to WebKit as "

webkit/api/public/gtk/WebInputEventFactory.h

 /*
  * Copyright (C) 2009 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 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebInputEventFactory_h
 #define WebInputEventFactory_h
 
 #include "../WebCommon.h"
 
 typedef struct _GdkEventButton GdkEventButton;
 typedef struct _GdkEventMotion GdkEventMotion;
-typedef struct _GdkEventCrossing GdkEventCrossing;
 typedef struct _GdkEventScroll GdkEventScroll;
 typedef struct _GdkEventKey GdkEventKey;
 
 namespace WebKit {
 
     class WebKeyboardEvent;
     class WebMouseEvent;
     class WebMouseWheelEvent;
 
     class WebInputEventFactory {
     public:
         WEBKIT_API static WebKeyboardEvent keyboardEvent(const GdkEventKey*);
         WEBKIT_API static WebKeyboardEvent keyboardEvent(wchar_t character, int state, double timeStampSeconds);
         WEBKIT_API static WebMouseEvent mouseEvent(const GdkEventButton*);
         WEBKIT_API static WebMouseEvent mouseEvent(const GdkEventMotion*);
-        WEBKIT_API static WebMouseEvent mouseEvent(const GdkEventCrossing*);
         WEBKIT_API static WebMouseWheelEvent mouseWheelEvent(const GdkEventScroll*);
     };
 
 } // namespace WebKit
 
 #endif