Migrate string refs over to createRef

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/views/voip/VideoFeed.js

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import React from 'react';
+import React, {createRef} from 'react';
 import PropTypes from 'prop-types';
 import createReactClass from 'create-react-class';
 
@@ -30,12 +30,16 @@ module.exports = createReactClass({
         onResize: PropTypes.func,
     },
 
+    UNSAFE_componentWillMount() {
+        this._vid = createRef();
+    },
+
     componentDidMount() {
-        this.refs.vid.addEventListener('resize', this.onResize);
+        this._vid.current.addEventListener('resize', this.onResize);
     },
 
     componentWillUnmount() {
-        this.refs.vid.removeEventListener('resize', this.onResize);
+        this._vid.current.removeEventListener('resize', this.onResize);
     },
 
     onResize: function(e) {
@@ -46,7 +50,7 @@ module.exports = createReactClass({
 
     render: function() {
         return (
-            <video ref="vid" style={{maxHeight: this.props.maxHeight}}>
+            <video ref={this._vid} style={{maxHeight: this.props.maxHeight}}>
             </video>
         );
     },