Shutdown me2me host cleanly on errors.
Shutdown me2me host cleanly on errors.

Previosly debug builds would always DCHECK because the host wasn't
shutdown properly

Review URL: https://chromiumcodereview.appspot.com/10131001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@133106 0039d316-1c4b-4281-b951-d872f2087c98

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