Summary:Motivation: Developer expects `onclose` to be called before/during close of the websocket. The `websocketFailed` event triggers a close but does not invoke onclose.
Testplan: Connect to a websocket server from android, terminate the server, observe that onerror is called, the websocket is closed, but onclose is not called.
Note: the observed bug is in android only because in iOS the underlying websocket implementation fires the `websocketClosed` rather than `websocketFailed` event when the server terminates. Nevertheless, the justification for this change stands that regardless of the cause of the close, if `this.close` is called it is expected this.onclose should be called as well.
Closes https://github.com/facebook/react-native/pull/6307
Differential Revision: D3017458
fb-gh-sync-id: c9e2dfefa597b4e99ee85eaa991667c347f86d83
shipit-source-id: c9e2dfefa597b4e99ee85eaa991667c347f86d83
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