IVersionControl: Remove parent argument

Never assigned

Change-Id: If5075210226c9d4efbf2b550a5587e5f60fb8d16
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/coreplugin/iversioncontrol.h

@@ -64,7 +64,7 @@ public:
         OpenMandatory  /*!< Files must always be opened by the VCS */
     };
 
-    explicit IVersionControl(QObject *parent = 0) : QObject(parent) {}
+    IVersionControl() {}
     virtual ~IVersionControl() {}
 
     virtual QString displayName() const = 0;