QmlProfiler: Consistently apply the d-pointer pattern to all models

Change-Id: I338291ee94f0301039c2b2e04b6c37fff66a2995
Reviewed-by: Kai Koehne <kai.koehne@digia.com>

src/plugins/qmlprofiler/qmlprofilerdatamodel.h

@@ -70,7 +70,8 @@ protected slots:
     void detailsChanged(int requestId, const QString &newString);
 
 private:
-    QVector<QmlEventData> m_eventList;
+    class QmlProfilerDataModelPrivate;
+    Q_DECLARE_PRIVATE(QmlProfilerDataModel)
 };
 
 }