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Instead of extension to the |GetEolStatus()| DBus method within
update_engine, it is completely viable for addition of the EOL related
fields into the |GetStatusAdvanced()| DBus method instead.

Within Chrome, the |UpdateEngineClient| will still expose
|GetEolStatus()| (will deprecate in the future crbug.com/1005511), but
now has |GetEolInfo()| method which internally calls
|GetStatsAdvanced()| instead of |GetEolStatus()| of update_engine to get
EOL info.

For eol_date field to be populated from CrOS please follow: chromium:1783897

Bug: 998983
Test: autoninja -C out_${SDK_BOARD}/Release chrome nacl_helper && deploy_chrome --build-dir=out_${SDK_BOARD}/Release --to=$IP
Test: autoninja -C out/Default unit_tests && testing/xvfb.py ./out/Default/unit_tests
Change-Id: I0d4d0e630336a374b3f4bdb546cfbab8ce7a89d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1811185Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Jae Hoon Kim <kimjae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701181}