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With this cl adding and removing languages to kAcceptLanguages will be handled by language_prefs.
The idea behind this refactoring work is to separate concepts of accept languages (saved in Chrome format, consumed by translate and non-translate clients) and blocked/fluent languages that are stored in translate format and are consumed by translate clients.
Next step is to move isFluent from language_prefs to translate_prefs.

Bug: 949251
Change-Id: I6971887bec72856c35ca61010c4ff6976f622164
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2565069Reviewed-by: Megan Jablonski <megjablon@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Trevor  Perrier <perrier@chromium.org>
Commit-Queue: Basia Zimirska <basiaz@google.com>
Cr-Commit-Position: refs/heads/master@{#834962}