Avoid crashing in AudioRendererImpl::DestroyTask during shutdown. (by checking ChildProcess::current() before dereferencing it blindly)
Avoid crashing in AudioRendererImpl::DestroyTask during shutdown.
(by checking ChildProcess::current() before dereferencing it blindly)

BUG=90197
TEST=trybots

Review URL: http://codereview.chromium.org/7693007

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@97564 0039d316-1c4b-4281-b951-d872f2087c98

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