ResourceLoaderLanguageDataModule: Clean up useless methods and fragile state

ResourceLoaderModule methods that need context should use context.
Setting a temporary property and then calling a bunch of methods
seems a bit fragile.

Though the actual instance could be passed around instead, in this
case the methods don't seem very useful. They're one-liner wrappers
that can just as well be done directly. It's not like we need the
abstraction for anything.

Follows-up f47dfe9.

Change-Id: I2f2f57896002fba87dc581dca61f5760ea5db31e
Merge "ResourceLoaderLanguageDataModule: Clean up useless methods and fragile state"