Test that MaterialApp can be inside a FocusScope (#9141)
Test that MaterialApp can be inside a FocusScope (#9141)

The underlying issue was fixed by the new focus system.

Fixes #1523
cbracken/flutter,Hixie/flutter,flutter/flutter,cbracken/flutter,tvolkert/flutter,cbracken/flutter,flutter/flutter,tvolkert/flutter,tvolkert/flutter,cbracken/flutter,cbracken/flutter,flutter/flutter,tvolkert/flutter,tvolkert/flutter,turnidge/flutter,flutter/flutter,tvolkert/flutter,tvolkert/flutter,turnidge/flutter,cbracken/flutter,Hixie/flutter,tvolkert/flutter,Hixie/flutter,cbracken/flutter,cbracken/flutter,flutter/flutter,turnidge/flutter,turnidge/flutter,Hixie/flutter,tvolkert/flutter,Hixie/flutter,cbracken/flutter,Hixie/flutter,flutter/flutter,flutter/flutter,flutter/flutter,flutter/flutter,Hixie/flutter,turnidge/flutter,Hixie/flutter,Hixie/flutter,Hixie/flutter,cbracken/flutter,tvolkert/flutter,flutter/flutter