Created SerializedUserDataManager.

ios/web/navigation/serialized_navigation_manager_builder.mm

Index: ios/web/navigation/serialized_navigation_manager_builder.mm
diff --git a/ios/web/navigation/serialized_navigation_manager_builder.mm b/ios/web/navigation/serialized_navigation_manager_builder.mm
index 6feddac4b074b688d34df2b49f911aff8addf492..88f6be2ba06f039b8f8a9e424638e36cdc0c8b47 100644
--- a/ios/web/navigation/serialized_navigation_manager_builder.mm
+++ b/ios/web/navigation/serialized_navigation_manager_builder.mm
@@ -8,6 +8,7 @@
 #import "ios/web/navigation/crw_serialized_navigation_manager.h"
 #import "ios/web/navigation/crw_session_controller.h"
 #include "ios/web/navigation/navigation_manager_impl.h"
+#include "ios/web/public/serialized_user_data_manager.h"
 
 // CRWSessionController's readonly properties redefined as readwrite.  These
 // will be removed and NavigationManagerImpl's ivars will be written directly
@@ -53,6 +54,11 @@ SerializedNavigationManagerBuilder::FromNavigationManager(
       session_controller.sessionCertificatePolicyManager;
   serialized_navigation_manager.xCallbackParameters =
       session_controller.xCallbackParameters;
+  web::SerializedUserDataManager* userDataManager =
+      web::SerializedUserDataManager::FromNavigationManager(navigation_manager);
+  serialized_navigation_manager.serializedUserData =
+      userDataManager->GetSerializationDictionary();
+
   return serialized_navigation_manager;
 }
 
@@ -83,6 +89,11 @@ SerializedNavigationManagerBuilder::ToNavigationManager(
   scoped_ptr<NavigationManagerImpl> navigation_manager(
       new NavigationManagerImpl());
   navigation_manager->SetSessionController(session_controller);
+  web::SerializedUserDataManager* userDataManager =
+      web::SerializedUserDataManager::FromNavigationManager(
+          navigation_manager.get());
+  userDataManager->AddValuesFromDictionary(
+      serialized_navigation_manager.serializedUserData);
   return navigation_manager.Pass();
 }