Use callback format with provided global

[pottedmeat]

As part of #270, using the global variable with strict mode and CSP unsafe-eval enforced means we need to retrieve the global object manually. dojo.js has been updated to retrieve this object and supports a function callback to its first argument to which it will pass this global object.

[dylans]

Thanks! Closed via 5d624ec. Backported as ef6ae23 (1.12), 57854aa (1.11), and 119fd1e (1.10).