Implemented consumer management unenrollment.

components/policy/core/common/cloud/cloud_policy_service.h

Index: components/policy/core/common/cloud/cloud_policy_service.h
diff --git a/components/policy/core/common/cloud/cloud_policy_service.h b/components/policy/core/common/cloud/cloud_policy_service.h
index efcbb3f6239d4f01ecc751eb1c284e75c4b6b856..80bb7a4022e2420f02f3bb75f28dd456f1c0d735 100644
--- a/components/policy/core/common/cloud/cloud_policy_service.h
+++ b/components/policy/core/common/cloud/cloud_policy_service.h
@@ -29,6 +29,10 @@ class POLICY_EXPORT CloudPolicyService : public CloudPolicyClient::Observer,
   // bool parameter is true if the refresh was successful (no error).
   typedef base::Callback<void(bool)> RefreshPolicyCallback;
 
+  // Callback invoked once the unregister attempt has completed. Passed bool
+  // parameter is true if unregistering was successful (no error).
+  typedef base::Callback<void(bool)> UnregisterCallback;

[bartfab (slow), 2014/11/28 13:25:19]

Nit: Use C++11 using = instead of typedef.

[davidyu, 2014/12/01 17:05:23]

Done.

+
   class POLICY_EXPORT Observer {
    public:
     // Invoked when CloudPolicyService has finished initializing (any initial
@@ -52,6 +56,11 @@ class POLICY_EXPORT CloudPolicyService : public CloudPolicyClient::Observer,
   // or aborts because of errors.
   void RefreshPolicy(const RefreshPolicyCallback& callback);
 
+  // Unregisters the device. |callback| will be invoked after the operation
+  // completes or aborts because of errors. All pending refresh policy requests
+  // will be aborted, and no further refresh policy requests will be allowed.
+  void Unregister(const UnregisterCallback& callback);
+
   // Adds/Removes an Observer for this object.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
@@ -76,6 +85,10 @@ class POLICY_EXPORT CloudPolicyService : public CloudPolicyClient::Observer,
   // is passed through to the refresh callbacks.
   void RefreshCompleted(bool success);
 
+  // Invokes the unregister callback and clears unregister state. The |success|
+  // flag is passed through to the unregister callback.
+  void UnregisterCompleted(bool success);
+
   // The policy namespace fetched by |client_| and expected by |store_|.
   PolicyNamespaceKey policy_ns_key_;
 
@@ -95,9 +108,17 @@ class POLICY_EXPORT CloudPolicyService : public CloudPolicyClient::Observer,
     REFRESH_POLICY_STORE,
   } refresh_state_;
 
+  // Tracks the state of a pending unregister operation, if any.
+  enum {
+    UNREGISTER_NONE,
+    UNREGISTER_PENDING,
+  } unregister_state_;
+
   // Callbacks to invoke upon policy refresh.
   std::vector<RefreshPolicyCallback> refresh_callbacks_;
 
+  UnregisterCallback unregister_callback_;
+
   // Set to true once the service is initialized (initial policy load/refresh
   // is complete).
   bool initialization_complete_;