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|ArcBackgroundAuthCodeFetcher| assumes that an auth code can only be
fetched for the Device Account. This assumption is no longer true.

Make |ArcBackgroundAuthCodeFetcher| accept |account_id| as a parameter
so that it can be used for Secondary Accounts too.

Bug: 871690
Test: browser_tests --gtest_filter="*ArcAuthServiceTest*"
Change-Id: I6deb6cff545a516e1842c6cba3fb0cd68defd653
Reviewed-on: https://chromium-review.googlesource.com/1172122
Commit-Queue: Kush Sinha <sinhak@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Lutz Justen <ljusten@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585457}