Valgrind: Add a ValgrindRunner member to the ValgrindToolRunner base

... instead of having one in each derived class.

Change-Id: Icd121ce46b1d161bd2d59eaeaad8363528dc3c23
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/valgrind/valgrindengine.h

@@ -55,10 +55,10 @@ signals:
 protected:
     virtual QString progressTitle() const = 0;
     virtual QStringList toolArguments() const = 0;
-    virtual Valgrind::ValgrindRunner *runner() = 0;
 
     ValgrindBaseSettings *m_settings = 0;
     QFutureInterface<void> m_progress;
+    ValgrindRunner m_runner;
 
 private:
     void handleProgressCanceled();