Make SyncBackendRegistrar aware of loaded data

chrome/browser/sync/abstract_profile_sync_service_test.cc

Index: chrome/browser/sync/abstract_profile_sync_service_test.cc
diff --git a/chrome/browser/sync/abstract_profile_sync_service_test.cc b/chrome/browser/sync/abstract_profile_sync_service_test.cc
index f12c501ef151a72a6690c06b2c947d98b34c75ad..b2d7da901e99640ee4201581fcb8da0533744096 100644
--- a/chrome/browser/sync/abstract_profile_sync_service_test.cc
+++ b/chrome/browser/sync/abstract_profile_sync_service_test.cc
@@ -117,10 +117,11 @@ void AbstractProfileSyncServiceTest::TearDown() {
   ui_loop_.RunAllPending();
 }
 
-bool AbstractProfileSyncServiceTest::CreateRoot(ModelType model_type) {
+bool AbstractProfileSyncServiceTest::CreateRoot(ModelType model_type,
+                                                UserShare* user_share) {
   return ProfileSyncServiceTestHelper::CreateRoot(
       model_type,
-      service_->GetUserShare(),
+      user_share,
       service_->id_factory());
 }
 
@@ -143,7 +144,7 @@ CreateRootHelper::CreateRootHelper(AbstractProfileSyncServiceTest* test,
 CreateRootHelper::~CreateRootHelper() {
 }
 
-const base::Closure& CreateRootHelper::callback() const {
+const base::Callback<void(UserShare*)>& CreateRootHelper::callback() const {
   return callback_;
 }
 
@@ -151,6 +152,6 @@ bool CreateRootHelper::success() {
   return success_;
 }
 
-void CreateRootHelper::CreateRootCallback() {
-  success_ = test_->CreateRoot(model_type_);
+void CreateRootHelper::CreateRootCallback(UserShare* user_share) {
+  success_ = test_->CreateRoot(model_type_, user_share);
 }