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The AudioDestinationConsumer interface and its single implementation
does not meet the bar for being on the Blink GC heap. It doesn't cause
harm to have them there, but in order to diagnose an unexplained
failure, pull these objects off the heap.

We may want to restore them to the Blink GC heap once the issue has
been resolved.

R=
BUG=682945

Review-Url: https://codereview.chromium.org/2748133003
Cr-Commit-Position: refs/heads/master@{#456736}