Valgrind: Random cleanups

Remove unneeded function arguments, Qt 5 connects etc.

Change-Id: I95faf80e7b5ccc574e2457b841f7913bc2aa05d3
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>

src/plugins/qmlprofiler/qmlprofilerruncontrol.cpp

@@ -115,7 +115,7 @@ bool QmlProfilerRunControl::startEngine()
         d->m_noDebugOutputTimer.start();
 
     d->m_profilerState->setCurrentState(QmlProfilerStateManager::AppRunning);
-    emit starting(this);
+    emit starting();
     return true;
 }