Fix Breakpoint storing in session

Task-number: QTCREATORBUG-9253

Change-Id: Idf517286394796e516115009789e6ff7df527c91
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/debugger/breakhandler.h

@@ -61,7 +61,6 @@ public:
 
     void loadSessionData();
     void saveSessionData();
-    void removeSessionData();
 
     QAbstractItemModel *model() { return this; }