QmlProfiler: remove dead code

The selectedEventChanged signal was never emitted and aliasing the
selectedItem property was unnecessary.

Change-Id: I2a15ad82bbf20a7ae9a42e17935242fbac7b5129
Reviewed-by: Kai Koehne <kai.koehne@digia.com>

src/plugins/qmlprofiler/qmlprofilertraceview.h

@@ -104,7 +104,6 @@ private slots:
 
 signals:
     void gotoSourceLocation(const QString &fileUrl, int lineNumber, int columNumber);
-    void selectedEventChanged(int eventId);
 
     void jumpToPrev();
     void jumpToNext();