[Gui] remove more unused headers

src/Gui/NavigationStyle.cpp

@@ -23,27 +23,23 @@
 
 #include "PreCompiled.h"
 #ifndef _PreComp_
-# include <algorithm>
-# include <cfloat>
 # include "InventorAll.h"
 # include <QAction>
 # include <QActionGroup>
 # include <QApplication>
 # include <QByteArray>
 # include <QCursor>
-# include <QList>
 # include <QMenu>
-# include <QMetaObject>
-# include <QRegExp>
 #endif
 
 #include <App/Application.h>
+
 #include "NavigationStyle.h"
-#include "View3DInventorViewer.h"
 #include "Application.h"
 #include "MenuManager.h"
 #include "MouseSelection.h"
 #include "SoMouseWheelEvent.h"
+#include "View3DInventorViewer.h"
 
 using namespace Gui;