Handle the case when the updates are disabled for a component.

components/update_client/action.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_UPDATE_CLIENT_ACTION_H_
 #define COMPONENTS_UPDATE_CLIENT_ACTION_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 22 matching lines @@
   enum class ErrorCategory {
     kErrorNone = 0,
     kNetworkError,
     kUnpackError,
     kInstallError,
     kServiceError,  // Runtime errors which occur in the service itself.
   };
 
   enum class ServiceError {
     ERROR_WAIT = 1,
+    ERROR_UPDATE_DISABLED = 2,
   };
 
   using Callback = base::Callback<void(int error)>;
   virtual ~Action() {}
 
   // Runs the code encapsulated by the action. When an action completes, it can
   // chain up and transfer the execution flow to another action or it can
   // invoke the |callback| when this function has completed and there is nothing
   // else to do.
   virtual void Run(UpdateContext* update_context, Callback callback) = 0;
@@ skipping 38 matching lines @@
   UpdateContext* update_context_;  // Not owned by this class.
   Action::Callback callback_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ActionImpl);
 };
 
 }  // namespace update_client
 
 #endif  // COMPONENTS_UPDATE_CLIENT_ACTION_H_