remove an unused class

QDrgResponseEvent wasn't used anywhere in Qt anymore.
Get rid of it.

src/gui/kernel/qevent.cpp

@@ -2447,21 +2447,6 @@ QDragEnterEvent::~QDragEnterEvent()
 {
 }
 
-/*!
-    Constructs a drag response event containing the \a accepted value,
-    indicating whether the drag and drop operation was accepted by the
-    recipient.
-*/
-QDragResponseEvent::QDragResponseEvent(bool accepted)
-    : QEvent(DragResponse), a(accepted)
-{}
-
-/*! \internal
-*/
-QDragResponseEvent::~QDragResponseEvent()
-{
-}
-
 /*!
     \class QDragMoveEvent
     \brief The QDragMoveEvent class provides an event which is sent while a drag and drop action is in progress.

src/gui/kernel/qevent.h

@@ -496,19 +496,6 @@ public:
 };
 
 
-/* An internal class */
-class Q_GUI_EXPORT QDragResponseEvent : public QEvent
-{
-public:
-    QDragResponseEvent(bool accepted);
-    ~QDragResponseEvent();
-
-    inline bool dragAccepted() const { return a; }
-protected:
-    bool a;
-};
-
-
 class Q_GUI_EXPORT QDragLeaveEvent : public QEvent
 {
 public:

src/tools/uic/qclass_lib_map.h

@@ -779,7 +779,6 @@ QT_CLASS_LIB(QInputMethodEvent, QtGui, qevent.h)
 QT_CLASS_LIB(QDropEvent, QtGui, qevent.h)
 QT_CLASS_LIB(QDragMoveEvent, QtGui, qevent.h)
 QT_CLASS_LIB(QDragEnterEvent, QtGui, qevent.h)
-QT_CLASS_LIB(QDragResponseEvent, QtGui, qevent.h)
 QT_CLASS_LIB(QDragLeaveEvent, QtGui, qevent.h)
 QT_CLASS_LIB(QHelpEvent, QtGui, qevent.h)
 QT_CLASS_LIB(QStatusTipEvent, QtGui, qevent.h)

src/widgets/statemachine/qguistatemachine.cpp

@@ -148,8 +148,6 @@ static QEvent *cloneEvent(QEvent *e)
         return new QDragLeaveEvent(*static_cast<QDragLeaveEvent*>(e));
     case QEvent::Drop:
         return new QDropEvent(*static_cast<QDragMoveEvent*>(e));
-    case QEvent::DragResponse:
-        return new QDragResponseEvent(*static_cast<QDragResponseEvent*>(e));
 #endif
     case QEvent::ChildAdded:
         return new QChildEvent(*static_cast<QChildEvent*>(e));