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There's currently no way to resume these sinks from html/js so there's
no point in restoring the sink state after disconnection. Specifically
you can't call MediaElementAudioSourceNode.disconnect() and expect the
underlying media element to be able to ever work again. See this demo:

http://storage.googleapis.com/dalecurtis/webaudio-test.html

Once AudioContext.createMediaElementSource(element) has been called on
an element, that element can never be used standalone again. It must
always be connected to the AudioContext to be used.

In fact it's actually causing unnecessary work when the elements are
destructed since removing the client respins the sink and mixer, etc.

BUG=910951
TEST=passes cq.
R=hongchan

Change-Id: I5ff7fc532545075d62859a30f96d17c83bff9d21
Reviewed-on: https://chromium-review.googlesource.com/c/1359092
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Hongchan Choi <hongchan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613346}