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This fixes an issue where supportedLanguages becomes stale, which causes
translate to be offered with a nil CWVTranslationLanguage.

Bug: 1012518
Change-Id: Iaed82b4c539443e38ba5198b0c87ae6bab28c7c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1848652
Commit-Queue: John Wu <jzw@chromium.org>
Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704216}