Utils/Coreplugin: Clean headers.

Change-Id: I1e0d432127651622d40ff990e1866eac9fac46a0
Reviewed-on: http://codereview.qt.nokia.com/3091
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>

src/plugins/coreplugin/variablechooser.cpp

@@ -35,7 +35,13 @@
 #include "variablemanager.h"
 #include "coreconstants.h"
 
+#include <utils/fancylineedit.h> // IconButton
+
 #include <QtCore/QTimer>
+#include <QtGui/QLineEdit>
+#include <QtGui/QTextEdit>
+#include <QtGui/QPlainTextEdit>
+#include <QtGui/QListWidgetItem>
 
 using namespace Core;