Thanks @gruehle. Tom moves it here because the old location is too early to show the update dialog and consequently the dialog is losing focus to the main editor causing issue #5602.

@TomMalbran I think we can keep this call back in brackets.js, but in a different location where we're done with asynchronous loading of the editor. That is, moves the entire if block that contains this call to the line above ``PerfUtils.addMeasurement("Application Startup");``.