IEditor: Remove unneeded empty virtual destructor.

QObject already has a virtual destructor.

Change-Id: Ie407226775d1690623ecc76adf29e1b3723abb0c
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/plugins/coreplugin/editormanager/ieditor.h

@@ -46,7 +46,6 @@ class CORE_EXPORT IEditor : public IContext
 
 public:
     IEditor(QObject *parent = 0);
-    virtual ~IEditor() {}
 
     bool duplicateSupported() const;
     void setDuplicateSupported(bool duplicateSupported);