Do not use QWeakPointer to track QObjects.

This use case is deprecated in Qt 5. Use QPointer instead.

Change-Id: Id6c32542032656d7cb31cf838d93a680ab9e9327
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/qmlprojectmanager/qmlproject.h

@@ -36,6 +36,7 @@
 #include <projectexplorer/project.h>
 
 #include <QDeclarativeEngine>
+#include <QPointer>
 
 namespace QmlJS { class ModelManagerInterface; }
 namespace Utils { class FileSystemWatcher; }
@@ -115,7 +116,7 @@ private:
 
     // qml based, new format
     QDeclarativeEngine m_engine;
-    QWeakPointer<QmlProjectItem> m_projectItem;
+    QPointer<QmlProjectItem> m_projectItem;
 
     Internal::QmlProjectNode *m_rootNode;
 };