[minor] Don't defer the events proxied from the BrowserChannel client
[minor] Don't defer the events proxied from the BrowserChannel client

There is no need to defer the `incoming::` prefixed events when using
the `browserchannel` transformer, because the issue that the deferred
events attempt to solve (https://gist.github.com/mloughran/2052006)
can only happen with WebSockets.

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