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Shut down explicitly, rather than doing it in a virtual destructor, which leads
to a vtable race.

(Possibly also related is http://crbug.com/70075, but I haven't been able to
reproduce, so I'll try to re-enable that separately.)

BUG=25841
TEST=ipc_tests + TSAN still happy


Review URL: https://chromiumcodereview.appspot.com/11761038

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@175487 0039d316-1c4b-4281-b951-d872f2087c98