Removed unused parameters, fix call on gcc 4.8

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

src/ui/MainWindow.cc

@@ -302,7 +302,7 @@ void MainWindow::_buildCommonWidgets(void)
     // Add generic MAVLink decoder
     // TODO: This is never deleted
     mavlinkDecoder = new MAVLinkDecoder(qgcApp()->toolbox()->mavlinkProtocol(), this);
-    connect(mavlinkDecoder, &MAVLinkDecoder::valueChanged, this, &MainWindow::valueChanged);
+    connect(mavlinkDecoder.data(), &MAVLinkDecoder::valueChanged, this, &MainWindow::valueChanged);
 
     // Log player
     // TODO: Make this optional with a preferences setting or under a "View" menu

src/ui/MainWindow.h

@@ -206,12 +206,6 @@ private:
 
     void _openUrl(const QString& url, const QString& errorMessage);
 
-    // Center widgets
-    QPointer<QWidget> _planView;
-    QPointer<QWidget> _flightView;
-    QPointer<QWidget> _setupView;
-    QPointer<QWidget> _missionEditorView;
-
 #ifndef __mobile__
     QMap<QString, QGCDockWidget*>   _mapName2DockWidget;
     QMap<QString, QAction*>         _mapName2Action;