Fix typo. The right button is pressed when MK_RBUTTON is set.

webkit/api/src/win/WebInputEventFactory.cpp

 /*
  * Copyright (C) 2006-2009 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 152 matching lines @@
     WebMouseEvent result; //(WebInputEvent::Uninitialized());
 
     switch (message) {
     case WM_MOUSEMOVE:
         result.type = WebInputEvent::MouseMove;
         if (wparam & MK_LBUTTON)
             result.button = WebMouseEvent::ButtonLeft;
         else if (wparam & MK_MBUTTON)
             result.button = WebMouseEvent::ButtonMiddle;
         else if (wparam & MK_RBUTTON)
-            result.button = WebMouseEvent::ButtonMiddle;
+            result.button = WebMouseEvent::ButtonRight;
         else
             result.button = WebMouseEvent::ButtonNone;
         break;
     case WM_MOUSELEAVE:
         result.type = WebInputEvent::MouseLeave;
         result.button = WebMouseEvent::ButtonNone;
         // set the current mouse position (relative to the client area of the
         // current window) since none is specified for this event
         lparam = GetRelativeCursorPos(hwnd);
         break;
@@ skipping 211 matching lines @@
         result.wheelTicksX = wheelDelta;
     } else {
         result.deltaY = scrollDelta;
         result.wheelTicksY = wheelDelta;
     }
 
     return result;
 }
 
 } // namespace WebKit