Editors: Provide a base implementation for {save,restore}State

Change-Id: Iedfc0d59ecfe257ad5823cff39977bce82ada3a5
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/imageviewer/imageviewer.cpp

@@ -163,27 +163,6 @@ void ImageViewer::setDisplayName(const QString &title)
     emit changed();
 }
 
-QByteArray ImageViewer::saveState() const
-{
-    return QByteArray();
-}
-
-bool ImageViewer::restoreState(const QByteArray &state)
-{
-    Q_UNUSED(state);
-    return true;
-}
-
-int ImageViewer::currentLine() const
-{
-    return 0;
-}
-
-int ImageViewer::currentColumn() const
-{
-    return 0;
-}
-
 bool ImageViewer::isTemporary() const
 {
     return false;