If a sync message can't be routed, respond immediately with an error. This will allow us to process alerts correctly if they happen after the tab has been closed in the browser process.
If a sync message can't be routed, respond immediately with an error.
This will allow us to process alerts correctly if they happen after
the tab has been closed in the browser process.

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@679 0039d316-1c4b-4281-b951-d872f2087c98

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