fix compile error for unused type

Author: TylerLeonhardt

src/vs/workbench/browser/web.main.ts

@@ -66,7 +66,6 @@ import { HTMLFileSystemProvider } from 'vs/platform/files/browser/htmlFileSystem
 import { IOpenerService } from 'vs/platform/opener/common/opener';
 import { safeStringify } from 'vs/base/common/objects';
 import { ICredentialsService } from 'vs/workbench/services/credentials/common/credentials';
-import { BrowserCredentialsService } from 'vs/workbench/services/credentials/browser/credentialsService';
 
 class BrowserMain extends Disposable {