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Both creaters of desk animations have a guard to stop creation of a new
animation. For enhanced desk animations, we will append to an existing
animation, so a vector is not needed anymore.

Test: manual
Bug: 1111445
Change-Id: Ic615e73cc28ac9bb1e7746782a1455c90e11a2a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2412687Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807308}