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This reverts commit 56d3597e and
relands the original CL.

Reason for revert: The failure (revert reason) doesn't seem to be
caused by this CL.

Original change's description:
> media: MediaBrowserTest not watching for plugin crash
>
> Now the CDM is not running in a plugin, there's no need for
> MediaBrowserTest to watch for plugin crash.

Bug: 772160
Change-Id: I387abcd37e85b703e2d0d1bf67be1f82dd68bf68
Reviewed-on: https://chromium-review.googlesource.com/1174852Reviewed-by: John Rummell <jrummell@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583304}