Fix fixture

Author: gaearon

fixtures/ssr/src/components/Chrome.js

@@ -1,8 +1,4 @@
-import React, {
-  Component,
-  Suspense,
-  unstable_startTransition as startTransition,
-} from 'react';
+import React, {Component, Suspense, startTransition} from 'react';
 
 import Theme, {ThemeToggleButton} from './Theme';
 

fixtures/ssr/src/index.js

@@ -3,4 +3,4 @@ import {hydrateRoot} from 'react-dom/client';
 
 import App from './components/App';
 
-let root = hydrateRoot(document, <App assets={window.assetManifest} />);
+hydrateRoot(document, <App assets={window.assetManifest} />);