Clean headers in Core-plugin.

Change-Id: Ie79d334765ca5c6a034fa2f5eccff5d45b481975
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/coreplugin/editmode.cpp

@@ -32,17 +32,14 @@
 #include "coreconstants.h"
 #include "modemanager.h"
 #include "minisplitter.h"
-#include "findplaceholder.h"
 #include "outputpane.h"
 #include "navigationwidget.h"
 #include "rightpane.h"
 #include "ieditor.h"
-#include "idocument.h"
 
 #include <QLatin1String>
 #include <QHBoxLayout>
 #include <QWidget>
-#include <QSplitter>
 #include <QIcon>
 
 using namespace Core;