Android: Remove enable_chrome_language_splits GN arg

It's purpose was to turn on splits. Now that they have shipped, there's
no need to be able to turn them off.

Leaving reference int diagnose_bloat.py (at least for a while) since
that script needs to be able to sync back past this change.

Change-Id: I9a4cfae043497e811db9fc8509688b8adee0fed5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1617134
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Ben Mason <benmason@chromium.org>
Commit-Queue: Ben Mason <benmason@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660932}
2 files changed