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This is necessary for the case where a dynamic group leader has its
resources revoked. In that situation, it needs to release its resources
without stopping the cast app; thus, the CastRenderer needs to remain
but the resources need to be released.

Test: With chromecast internal changes on 1.40ac branch.
Bug: b/141143745
Change-Id: Ia69aa32e7f97bd4126bead4f650f210d00e98d02
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872240
Commit-Queue: Antonio Rivera <antoniori@google.com>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708038}