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Revert of Fix DCHECK when track status changes in non-playing state (patchset #3 id:40001 of https://codereview.chromium.org/2269313002/ )

Reason for revert:
The new test is crashing on Mac

Original issue's description:
> Fix DCHECK when track status changes in non-playing state
>
> We are only accessing shared_state_.renderer in kPlaying state.
>
> BUG=640362
>
> Committed: https://crrev.com/5f450aa795c85f615ccaed457f3114c487df7ac4
> Cr-Commit-Position: refs/heads/master@{#416131}

TBR=avayvod@chromium.org,chcunningham@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=640362

Review-Url: https://codereview.chromium.org/2310483002
Cr-Commit-Position: refs/heads/master@{#416309}