Use Class and Property Decorators (#3730)

ref https://tc39.github.io/proposal-decorators/

app/javascript/mastodon/features/compose/components/search.js

@@ -6,7 +6,8 @@ const messages = defineMessages({
   placeholder: { id: 'search.placeholder', defaultMessage: 'Search' },
 });
 
-class Search extends React.PureComponent {
+@injectIntl
+export default class Search extends React.PureComponent {
 
   static propTypes = {
     value: PropTypes.string.isRequired,
@@ -70,5 +71,3 @@ class Search extends React.PureComponent {
   }
 
 }
-
-export default injectIntl(Search);