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This commit adds the Oxford English Dictionary variant of the
British English (en-GB) locale to allow for strict spellchecking
when using the corresponding locale (en-GB-oxendict) as distinguished
from the generic British English (en-GB) locale.

Bug: chromium:1064659
Change-Id: Ia625a3566b7d89475c4853562ebbdb3afe7f9ffc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2140610
Commit-Queue: Guillaume Jenkins <gujen@google.com>
Reviewed-by: edchin <edchin@chromium.org>
Reviewed-by: Guillaume Jenkins <gujen@google.com>
Reviewed-by: anthonyvd <anthonyvd@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784165}