QmlProfiler: Remove unused members from QmlProfilerEnginePrivate

Change-Id: I597f214f3c7c912acc137f2fb453836ee712720b
Reviewed-by: Christiaan Janssen <christiaan.janssen@digia.com>
QmlProfiler: Remove unused class member

Change-Id: I67b27bbe541054feec6642b6906360f99cdb5297
Reviewed-by: Christiaan Janssen <christiaan.janssen@digia.com>