Fix getHeaders() comment

client/browser/src/shared/backend/headers.tsx

@@ -5,9 +5,7 @@ import { getExtensionVersionSync, getPlatformName } from '../util/context'
  * Requests can be blocked for various reasons and therefore the HTTP request MUST use the headers returned here.
  */
 export function getHeaders(): { [name: string]: string } | undefined {
-    // This is required (in most cases) for requests to be allowed by Sourcegraph's CORS rules. It
-    // is not required for browser extension background worker requests, but it's harmless to
-    // include it for those, too.
+    // This is required for requests to be allowed by Sourcegraph's CORS rules.
     return {
         'X-Requested-With': `Sourcegraph - ${getPlatformName()} v${getExtensionVersionSync()}`,
     }