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

ios/chrome/browser/component_updater/ios_component_updater_configurator.cc

Index: ios/chrome/browser/component_updater/ios_component_updater_configurator.cc
diff --git a/ios/chrome/browser/component_updater/ios_component_updater_configurator.cc b/ios/chrome/browser/component_updater/ios_component_updater_configurator.cc
index f171fb32d7e409706e1c946008ac8f5aa6dea353..e09873bf902ee90a3a6f618c92ccd45b70275270 100644
--- a/ios/chrome/browser/component_updater/ios_component_updater_configurator.cc
+++ b/ios/chrome/browser/component_updater/ios_component_updater_configurator.cc
@@ -11,6 +11,7 @@
 #include "base/version.h"
 #include "components/component_updater/configurator_impl.h"
 #include "components/update_client/out_of_process_patcher.h"
+#include "components/update_client/persisted_data.h"
 #include "components/update_client/update_query_params.h"
 #include "ios/chrome/browser/application_context.h"
 #include "ios/chrome/browser/google/google_brand.h"
@@ -52,6 +53,7 @@ class IOSConfigurator : public update_client::Configurator {
       const override;
   PrefService* GetPrefService() const override;
   bool IsPerUserInstall() const override;
+  std::unique_ptr<update_client::PersistedData> CreateMetadata() const override;
 
  private:
   friend class base::RefCountedThreadSafe<IOSConfigurator>;
@@ -169,6 +171,11 @@ bool IOSConfigurator::IsPerUserInstall() const {
   return true;
 }
 
+std::unique_ptr<update_client::PersistedData> IOSConfigurator::CreateMetadata()
+    const {
+  return base::MakeUnique<update_client::PersistedData>(GetPrefService());
+}
+
 }  // namespace
 
 scoped_refptr<update_client::Configurator> MakeIOSComponentUpdaterConfigurator(