Make the multimedia examples less verbose

Important warnings such as missing services are still printed though.

Task-number: QTBUG-31080
Change-Id: I96fd3837c4edc58c61b97bf950b7cab05ceed014
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Christian Stromme <christian.stromme@digia.com>

examples/multimedia/audioinput/audioinput.h

@@ -110,11 +110,9 @@ private:
 
 private slots:
     void refreshDisplay();
-    void notified();
     void readMore();
     void toggleMode();
     void toggleSuspend();
-    void handleStateChanged(QAudio::State state);
     void deviceChanged(int index);
     void sliderChanged(int value);