Tooltip: Remove TipFactory

It's not really used as such.

Change-Id: Ia748cdb5273d661dfea9f8f39a17a872d3ee4de6
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: David Schulz <david.schulz@digia.com>

src/libs/utils/tooltip/tooltip.h

@@ -53,11 +53,7 @@ class QWidget;
 QT_END_NAMESPACE
 
 namespace Utils {
-
-namespace Internal {
-class TipFactory;
-class QTipLabel;
-}
+namespace Internal { class QTipLabel; }
 
 class TipContent;
 
@@ -95,7 +91,6 @@ private:
     void showTip();
     void hideTipWithDelay();
 
-    Internal::TipFactory *m_tipFactory;
     Internal::QTipLabel *m_tip;
     QWidget *m_widget;
     QRect m_rect;