Revert to UNSAFE_componentWillMount where componentDidMount will not work

src/components/structures/MatrixChat.js

@@ -221,7 +221,8 @@ export default createReactClass({
         return {serverConfig: props};
     },
 
-    componentDidMount: function() {
+    // TODO: [REACT-WARNING] Move this to constructor
+    UNSAFE_componentWillMount: function() {
         SdkConfig.put(this.props.config);
 
         // Used by _viewRoom before getting state from sync

src/components/structures/RoomDirectory.js

@@ -56,7 +56,8 @@ export default createReactClass({
         };
     },
 
-    componentDidMount: function() {
+    // TODO: [REACT-WARNING] Move this to constructor
+    UNSAFE_componentWillMount: function() {
         this._unmounted = false;
         this.nextBatch = null;
         this.filterTimeout = null;

src/components/structures/auth/Login.js

@@ -113,7 +113,8 @@ export default createReactClass({
         };
     },
 
-    componentDidMount: function() {
+    // TODO: [REACT-WARNING] Move this to constructor
+    UNSAFE_componentWillMount: function() {
         this._unmounted = false;
 
         // map from login step type to a function which will render a control