QmlJS: Remove undefined method

Change-Id: I06439c81bf7b194a2e32d1301e71a2c26e163d03
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@digia.com>

src/libs/qmljs/qmljsmodelmanagerinterface.h

@@ -88,8 +88,6 @@ public:
         bool isNull() const
         { return project.isNull(); }
 
-        QStringList completeImportPaths();
-
     public: // attributes
         QPointer<ProjectExplorer::Project> project;
         QStringList sourceFiles;