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

components/update_client/update_checker.h

Index: components/update_client/update_checker.h
diff --git a/components/update_client/update_checker.h b/components/update_client/update_checker.h
index ac6e0a468ba7f6967b4f6b5d98e09a501a155757..803e788e20cb3c8a8a45d1ff0542b2d6b74665d8 100644
--- a/components/update_client/update_checker.h
+++ b/components/update_client/update_checker.h
@@ -19,7 +19,6 @@
 namespace update_client {
 
 class Configurator;
-class PersistedData;
 
 class UpdateChecker {
  public:
@@ -27,8 +26,7 @@ class UpdateChecker {
       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;
 
@@ -46,8 +44,7 @@ class UpdateChecker {
       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;