Also move the class to the parent package, since it's no longer tied to the
spell checking service.
Bug 19966848.
Bug 20036810.
Change-Id: I35014d212fd87281eb90def03ee92e6872dcd63e
There should be 1 executor each for static and dynamic language models.
This prevents too many dynamic LM updates from running in parallel,
competing for resources.
Change-Id: I8ec439e0ea2d92fba275bc20a0b8c9193346a0c1