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This ID is not needed since there's a strict 1:1 mapping between the
media player (Renderer) and CDM in Chromium.

Bug: 999747
Change-Id: I5cbe7346a29d2ef47be3c307e508db037c71b102
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2314668Reviewed-by: John Rummell <jrummell@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792340}