Get rid of DiffEditor::editorWidget();

Change-Id: I3078002359871dad74d4a07924d5beeaeb9f82ba
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/diffeditor/diffeditor.h

@@ -63,7 +63,7 @@ public:
     bool open(QString *errorString, const QString &fileName, const QString &realFileName);
     Core::IDocument *document();
     Core::Id id() const;
-    DiffEditorWidget *editorWidget() const { return m_editorWidget; }
+    QTextCodec *codec() const;
 
     QWidget *toolBar();