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Terminal System app will call
chrome.terminalPrivate.getCroshSettings to get the current
settings used by crosh in order to migrate any settings.

This migration code will be removed after M83.

Terminal System app will add some local storage to
indicate that migration has been done, so this function
should only be called once ever by Terminal System App.

This code reads from the crosh extension sync storage where
settings are currently stored.  It is a close copy of
extensions/browser/api/storage/storage_api code.
https://cs.chromium.org/chromium/src/extensions/browser/api/storage/storage_api.cc?l=71-83&rcl=115bc01b385b57e8f96c4fa0b117e887a26cd55e

TBR=benwells@chromium.org

Bug: 1019021
Change-Id: I5287e804ac2c2a8c1eaf2fe7f14c8012f88b1c7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899626
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Julian Watson <juwa@google.com>
Cr-Commit-Position: refs/heads/master@{#712899}