Removed unnecessary import

Author: maneesht

packages/firestore/src/platform/browser/webchannel_connection.ts

@@ -46,7 +46,6 @@ import { Code, FirestoreError } from '../../util/error';
 import { logDebug, logWarn } from '../../util/log';
 import { Rejecter, Resolver } from '../../util/promise';
 import { StringMap } from '../../util/types';
-import { isCloudWorkstation } from '@firebase/util';
 
 const LOG_TAG = 'WebChannelConnection';