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..4634a441af7e500f1a061db0c6d8734fbc7bcaaa 100644
--- a/ios/chrome/browser/component_updater/ios_component_updater_configurator.cc
+++ b/ios/chrome/browser/component_updater/ios_component_updater_configurator.cc
@@ -7,10 +7,12 @@
 #include <string>
 #include <vector>
 
+#include "base/memory/ptr_util.h"
 #include "base/threading/sequenced_worker_pool.h"
 #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 +54,7 @@ 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 +172,11 @@ 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(