[Audible Metrics] Fix concurrent playback histogram
The CloseNewestToExitConcurrentPlayback histogram was not being recorded because of a race condition between closing the tab and becoming inaudible and the web contents being destroyed. This changes the metrics to check if a web contents was recently audible instead of whether it is currently audible. BUG=936196 Change-Id: Ie3c1d8bbb0e11b099acbc2c163aeedf4b1c9d58f Reviewed-on: https://chromium-review.googlesource.com/c/1490494Reviewed-by:Frank Liberato <liberato@chromium.org> Commit-Queue: Becca Hughes <beccahughes@chromium.org> Cr-Commit-Position: refs/heads/master@{#636274}
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