chrome: Cleanup class/struct forward declarations

chrome/browser/policy/profile_policy_connector_factory.h

 // Copyright (c) 2013 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 CHROME_BROWSER_POLICY_PROFILE_POLICY_CONNECTOR_FACTORY_H_
 #define CHROME_BROWSER_POLICY_PROFILE_POLICY_CONNECTOR_FACTORY_H_
 
 #include <list>
 #include <map>
 #include <memory>
 
 #include "base/macros.h"
 #include "components/keyed_service/content/browser_context_keyed_base_factory.h"
 
 namespace base {
 template <typename T>
 struct DefaultSingletonTraits;
 
-class SequencedTaskRunner;
 }  // namespace base
 
 namespace content {
 class BrowserContext;
 }
 
 namespace policy {
 
 class ConfigurationPolicyProvider;
 class ProfilePolicyConnector;
@@ skipping 56 matching lines @@
       ConnectorMap;
   ConnectorMap connectors_;
   std::list<ConfigurationPolicyProvider*> test_providers_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfilePolicyConnectorFactory);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_PROFILE_POLICY_CONNECTOR_FACTORY_H_