components: Cleanup class/struct fwd declarations

components/password_manager/core/browser/affiliated_match_helper.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_AFFILIATED_MATCH_HELPER_H_
 #define COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_AFFILIATED_MATCH_HELPER_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "components/password_manager/core/browser/affiliation_utils.h"
 #include "components/password_manager/core/browser/password_store.h"
 #include "components/password_manager/core/browser/password_store_consumer.h"
 
 namespace autofill {
 struct PasswordForm;
 }  // namespace autofill
 
-namespace base {
-struct SingleThreadedTaskRunner;
-}  // namespace base
-
 namespace password_manager {
 
 class AffiliationService;
 
 // Interacts with the AffiliationService on behalf of the PasswordStore.
 // For each GetLogins() request, it provides the PasswordStore with a list of
 // additional realms that are affiliation-based matches to the observed realm.
 //
 // Currently, the only supported use-case is obtaining Android applications
 // affiliated with the web site containing the observed form. This is achieved
@@ skipping 121 matching lines @@
   std::unique_ptr<AffiliationService> affiliation_service_;
 
   base::WeakPtrFactory<AffiliatedMatchHelper> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AffiliatedMatchHelper);
 };
 
 }  // namespace password_manager
 
 #endif  // COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_AFFILIATED_MATCH_HELPER_H_