Remove TimelineTraceManager::State

This is redundant, now that we have registerFeatures().

Change-Id: Ia56c28b8892ab6da694570fe4b9ea5c96fe194f1
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/qmlprofiler/qmlprofilerstatewidget.h

@@ -45,8 +45,9 @@ public:
 private:
     void showText(const QString &text);
     void updateDisplay();
-    void update();
     void reposition();
+    void initialize();
+    void clear();
 
     class QmlProfilerStateWidgetPrivate;
     QmlProfilerStateWidgetPrivate *d;