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This CL prevents media notifications from unfreezing if they are still
waiting on new MediaSessionActions. This prevents an issue where
notifications would change sizes briefly because they had no actions to
show.

Bug: 1055254
Change-Id: I2345188626b332846a7b51c93545a1b40764044e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090291Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747363}