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The problem was that the controller was not registering itself as an observer.

BUG=682890

Change-Id: Ic37a692c2879069734d25eaf38f7f5448bcb212f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1565372Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Tim Song <tengs@chromium.org>
Commit-Queue: Tim Song <tengs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#650471}