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We want to move away from OnInstallStatus signal and instead move to a
per-DLC signal DlcStateChanged. This new signal is designed to make it
much easier for clients to monitor the state of a DLC.

BUG=chromium:1071260
TEST=./testing/xvfb.py ./out/Default/unit_tests --gtest_filter=Dlc*

Change-Id: Ibc042670afb5ec1fa9183bb20833d12c911ec94f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2213892
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Auto-Submit: Amin Hassani <ahassani@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772252}