ComponentCloudPolicyService tracks the signin state.

chrome/browser/policy/cloud/component_cloud_policy_store.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_CLOUD_COMPONENT_CLOUD_POLICY_STORE_H_
 #define CHROME_BROWSER_POLICY_CLOUD_COMPONENT_CLOUD_POLICY_STORE_H_
 
 #include <map>
 #include <string>
 
@@ skipping 76 matching lines @@
              const std::string& data);
 
   // Deletes the storage of namespace |ns| and stops serving its policies.
   void Delete(const PolicyNamespace& ns);
 
   // Deletes the storage of all components of |domain| that pass then given
   // |filter|, and stops serving their policies.
   void Purge(PolicyDomain domain,
              const ResourceCache::SubkeyFilter& filter);
 
+  // Deletes the storage of every component.
+  void Clear();
+
   // Validates |proto| and returns the corresponding policy namespace in |ns|,
   // and the parsed ExternalPolicyData in |payload|.
   // If |proto| validates successfully then its |payload| can be trusted, and
   // the data referenced there can be downloaded. A |proto| must be validated
   // before attempting to download the data, and before storing both.
   bool ValidatePolicy(
       scoped_ptr<enterprise_management::PolicyFetchResponse> proto,
       PolicyNamespace* ns,
       enterprise_management::ExternalPolicyData* payload);
 
@@ skipping 25 matching lines @@
 
   PolicyBundle policy_bundle_;
   std::map<PolicyNamespace, std::string> cached_hashes_;
 
   DISALLOW_COPY_AND_ASSIGN(ComponentCloudPolicyStore);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_CLOUD_COMPONENT_CLOUD_POLICY_STORE_H_