chore(privateMocks): use global `angular` to access helpers in `they`
chore(privateMocks): use global `angular` to access helpers in `they`

When using `they` in modules such as `ngMessages` we do not have access to
the internal helper functions.

ggershoni/angular.js,ggershoni/angular.js,ggershoni/angular.js,ggershoni/angular.js