Added default implementation for IEditorFactory::open().

This change allows to avoid massive code duplication along editors.

Change-Id: Ifdc6ae4b44ab399d34193ab8dddfa1f76d65ad11
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>

src/plugins/genericprojectmanager/genericprojectfileseditor.h

@@ -62,7 +62,6 @@ public:
     virtual QStringList mimeTypes() const;
     virtual Core::Id id() const;
     virtual QString displayName() const;
-    virtual Core::IDocument *open(const QString &fileName);
 
 private:
     TextEditor::TextEditorActionHandler *m_actionHandler;