QmlProfiler: Don't needlessly use AbstractTimelineModelPrivate

We can easily implement all specialized models with only the public
interface.

Change-Id: I2fc75ad4a4270d9dd40068e78f9364f3963805e0
Reviewed-by: Kai Koehne <kai.koehne@theqtcompany.com>

src/plugins/qmlprofiler/qmlprofilerrangemodel.h

@@ -82,8 +82,12 @@ protected:
     void clear();
 
 private:
-    class QmlProfilerRangeModelPrivate;
-    Q_DECLARE_PRIVATE(QmlProfilerRangeModel)
+    void computeNestingContracted();
+    void computeExpandedLevels();
+    void findBindingLoops();
+
+    QVector<QmlRangeEventStartInstance> m_data;
+    QVector<int> m_expandedRowTypes;
 };
 
 }