Remove unused toolTip member variable (qt3 leftover)

Change-Id: Ia68fb00afb81a0f521f9fbc3f0dbfc7e43075bbe
Reviewed-by: laurent montel <laurent.montel@kdab.com>
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>

src/widgets/widgets/qworkspace.cpp

@@ -290,9 +290,6 @@ public:
     QWorkspaceTitleBarPrivate()
         :
         lastControl(QStyle::SC_None),
-#ifndef QT_NO_TOOLTIP
-        toolTip(0),
-#endif
         act(0), window(0), movable(1), pressed(0), autoraise(0), moving(0)
     {
     }
@@ -301,9 +298,6 @@ public:
     QStyle::SubControl buttonDown;
     QStyle::SubControl lastControl;
     QPoint moveOffset;
-#ifndef QT_NO_TOOLTIP
-    QToolTip *toolTip;
-#endif
     bool act                    :1;
     QPointer<QWidget> window;
     bool movable            :1;