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We keep it private to QmlProfilerModelManager and proxy the last few
methods that were directly called on the model. This enables us to
remove the QmlProfilerDataModel class by integrating what is left of it
into QmlProfilerModelManagerPrivate in a next step.

Change-Id: Ie9b4e03fb286e5a0040374d00b7b26f810426278
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>