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Now the CDM is not running in a plugin, there's no need for
MediaBrowserTest to watch for plugin crash.

For the record, see the original CL that added this:
https://codereview.chromium.org/206693004

Bug: 772160
Test: Remove obsolete code. No functionality change.
Change-Id: I8c0a9e74cc4c1d05b153f1e80a0882ee28287ac7
Reviewed-on: https://chromium-review.googlesource.com/1091888Reviewed-by: Frank Liberato <liberato@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565649}