Remove unused header include

src/plugins/coreplugin/mainwindow.cpp

@@ -30,7 +30,6 @@
 #include "mainwindow.h"
 #include "actioncontainer.h"
 #include "actionmanager_p.h"
-#include "basemode.h"
 #include "coreimpl.h"
 #include "coreconstants.h"
 #include "editormanager.h"

src/plugins/coreplugin/mainwindow.h

@@ -49,7 +49,6 @@ QT_END_NAMESPACE
 namespace Core {
 
 class ActionManager;
-class BaseMode;
 class StatusBarWidget;
 class EditorManager;
 class FileManager;