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As this observer method has no production listeners, it is simply dead code.

Bug: 922406
Change-Id: I9aa23327aed829111ca03ba3013840fdac5542d7
Reviewed-on: https://chromium-review.googlesource.com/c/1452443
Commit-Queue: David Roger <droger@chromium.org>
Auto-Submit: David Roger <droger@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629923}