Debugger: Remove obsolete function declation

Change-Id: Ic528f0a97341773093822089bcc66f096f5e2327
Reviewed-by: hjk <hjk@qt.io>

src/plugins/debugger/debuggerplugin.cpp

@@ -706,7 +706,6 @@ public:
     void runScheduled();
     void attachCore();
 
-    void runControlFinished(DebuggerRunTool *runTool);
     void remoteCommand(const QStringList &options);
 
     void dumpLog();