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This CL updates SODA to take in a path to the language pack direcotry
instead of a path to the dictation.ascii_proto config file. SODA will
instead choose the appropriate config file to use within the language
pack directory.

Google3-side changes: cl/326259391

Bug: 1124367
Change-Id: I3ec52682a1d22afe9077a9ddfdb02c054319fa14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2391283Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Evan Liu <evliu@google.com>
Cr-Commit-Position: refs/heads/master@{#804122}