js-sdk interactive auth now sends email token

We previously sent it in componentWillMount of the email token
auth component which definitely gets us on react's naughtly list.
We now pass the js-sdk a callback it can call at the appropriate
time to send the token (https://github.com/matrix-org/matrix-js-sdk/pull/926).

We should make password reset and adding email addresses work the
same way, but currently they don't even use the interactive-auth
helpers(!) so they're unaffected.

https://github.com/vector-im/riot-web/issues/9586

src/components/structures/auth/Registration.js

@@ -2,6 +2,7 @@
 Copyright 2015, 2016 OpenMarket Ltd
 Copyright 2017 Vector Creations Ltd
 Copyright 2018, 2019 New Vector Ltd
+Copyright 2019 The Matrix.org Foundation C.I.C.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -203,6 +204,20 @@ module.exports = React.createClass({
         });
     },
 
+    _requestEmailToken: function(emailAddress, clientSecret, sendAttempt, sessionId) {
+        return this._matrixClient.requestRegisterEmailToken(
+            emailAddress,
+            clientSecret,
+            sendAttempt,
+            this.props.makeRegistrationUrl({
+                client_secret: clientSecret,
+                hs_url: this._matrixClient.getHomeserverUrl(),
+                is_url: this._matrixClient.getIdentityServerUrl(),
+                session_id: sessionId,
+            }),
+        );
+    },
+
     _onUIAuthFinished: async function(success, response, extra) {
         if (!success) {
             let msg = response.message || response.toString();
@@ -424,7 +439,7 @@ module.exports = React.createClass({
                 makeRequest={this._makeRegisterRequest}
                 onAuthFinished={this._onUIAuthFinished}
                 inputs={this._getUIAuthInputs()}
-                makeRegistrationUrl={this.props.makeRegistrationUrl}
+                requestEmailToken={this._requestEmailToken}
                 sessionId={this.props.sessionId}
                 clientSecret={this.props.clientSecret}
                 emailSid={this.props.idSid}