Use ES6 style import

src/components/views/elements/MessageSpinner.js

@@ -14,9 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-'use strict';
-
-const React = require('react');
+import React from 'react';
 
 module.exports = React.createClass({
     displayName: 'MessageSpinner',