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This tests the case where MojoRenderer::SetCdm() is called with a CDM ID
where the CDM has already been released.

Bug: 1004730
Test: Add a unittest.
Change-Id: Ia400ccdfac74fb6153c46ba3b216c325b8ea2327
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1819624Reviewed-by: John Rummell <jrummell@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699061}