Bug 1059245 - Update tests and framework to use the new Browser app

Added a [wait][link] for the displayed name. The name of the windows is not Browser, it's the url. The name "Browser" is for the search app.

[link]:https://github.com/mozilla-b2g/gaia/pull/23467/files#diff-1bb2df0456ffde6fc4eed57d1254a907R26