Prepare to abstract PersistedData by making it part of the configurator.

components/update_client/update_checker.h

 // Copyright 2014 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_UPDATE_CHECKER_H_
 #define COMPONENTS_UPDATE_CLIENT_UPDATE_CHECKER_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "components/update_client/component.h"
 #include "components/update_client/update_response.h"
 #include "url/gurl.h"
 
 namespace update_client {
 
 class Configurator;
-class PersistedData;
 
 class UpdateChecker {
  public:
   using UpdateCheckCallback =
       base::Callback<void(int error, int retry_after_sec)>;
 
   using Factory = std::unique_ptr<UpdateChecker> (*)(
-      const scoped_refptr<Configurator>& config,
-      PersistedData* persistent);
+      const scoped_refptr<Configurator>& config);
 
   virtual ~UpdateChecker() = default;
 
   // Initiates an update check for the components specified by their ids.
   // |additional_attributes| provides a way to customize the <request> element.
   // This value is inserted as-is, therefore it must be well-formed as an
   // XML attribute string.
   // On completion, the state of |components| is mutated as required by the
   // server response received.
   virtual bool CheckForUpdates(
       const std::vector<std::string>& ids_to_check,
       const IdToComponentPtrMap& components,
       const std::string& additional_attributes,
       bool enabled_component_updates,
       const UpdateCheckCallback& update_check_callback) = 0;
 
   static std::unique_ptr<UpdateChecker> Create(
-      const scoped_refptr<Configurator>& config,
-      PersistedData* persistent);
+      const scoped_refptr<Configurator>& config);
 
  protected:
   UpdateChecker() = default;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(UpdateChecker);
 };
 
 }  // namespace update_client
 
 #endif  // COMPONENTS_UPDATE_CLIENT_UPDATE_CHECKER_H_