login: use same observer list policy in real and fake concierge client
This change is needed to ensure that fake behaves the same as real client and we can use it in the unit test to validate that arc instance stopped is not fired on unrelated instance. BUG=b:164816080 TEST=cq Change-Id: Ice5e588b81231ac87b78dafd25188d6629b38bd5 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2469231 Auto-Submit: Muhammad Hasan Khan <mhasank@chromium.org> Commit-Queue: Muhammad Hasan Khan <mhasank@chromium.org> Reviewed-by:Ryo Hashimoto <hashimoto@chromium.org> Cr-Commit-Position: refs/heads/master@{#816907}
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