ngAria module and $ariaProvider configurations are global

[sriprabha]

Currently, when I inject ngAria dependency for one view in the application, it defaults to injecting it across the application and adds all the defaults like tabindex to the HTML semantics.
When I configure ngAria further using $ariaProvider to NOT add the tabindex (for test purpose), the configuration gets applied at other places as well where the dependency on ngAria was not injected. Making ngAria or $ariaProvider more private scoped may provide more flexibility to a developer to provide accessibility support.

[marcysutton]

I wonder if a view-specific override system would work. On Angular Material, we're going to start checking the $ariaProvider to make sure we don't override it. We'd have to take things like that into account when building a more locally-scoped ngAria config. angular/material#600