QmlProfiler: Fix missing declaration

Change-Id: If783fe330bccd19140dd916c42dfe7f424b68a85
Reviewed-by: Ulf Hermann <ulf.hermann@theqtcompany.com>

src/plugins/qmlprofiler/qmlprofilerstatewidget.h

@@ -48,6 +48,7 @@ public:
     ~QmlProfilerStateWidget();
 
 private slots:
+    void showText(const QString &text, bool showProgress = false);
     void updateDisplay();
     void dataStateChanged();
     void profilerStateChanged();