Further decompose isSupported

Author: zwu52

packages-exp/messaging-exp/src/api.ts

@@ -23,7 +23,6 @@ import { MessagingService } from './messaging-service';
 import { Provider } from '@firebase/component';
 import { deleteToken as _deleteToken } from './api/deleteToken';
 import { getToken as _getToken } from './api/getToken';
-import { isSupported as _isSupported } from './api/isSupported';
 import { onBackgroundMessage as _onBackgroundMessage } from './api/onBackgroundMessage';
 import { onMessage as _onMessage } from './api/onMessage';
 import { getModularInstance } from '@firebase/util';
@@ -137,10 +136,3 @@ export function onBackgroundMessage(
   messaging = getModularInstance(messaging);
   return _onBackgroundMessage(messaging as MessagingService, nextOrObserver);
 }
-
-/**
- * Checks if the current browser is supported.
- */
-export async function isSupported(): Promise<boolean> {
-  return _isSupported();
-}