QmlProject: Simplify interface a bit

Remove unneeded code and don't repeately fetch a singleton value.

Change-Id: I718a44c28be7ef8718f813f987f45b32cbcd7ad5
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/qmlprojectmanager/qmlproject.h

@@ -33,7 +33,6 @@
 #include <QPointer>
 
 namespace ProjectExplorer { class RunConfiguration; }
-namespace QmlJS { class ModelManagerInterface; }
 
 namespace QmlProjectManager {
 
@@ -91,8 +90,6 @@ private:
 
     // plain format
     void parseProject(RefreshOptions options);
-    QStringList convertToAbsoluteFiles(const QStringList &paths) const;
-    QmlJS::ModelManagerInterface *modelManager() const;
 
     QmlImport m_defaultImport;
     ProjectExplorer::Target *m_activeTarget = 0;