Make SyncBackendRegistrar aware of loaded data

chrome/browser/sync/profile_sync_service_startup_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/signin/signin_manager.h"
@@ skipping 65 matching lines @@
     SigninManager* signin = static_cast<SigninManager*>(
       SigninManagerFactory::GetInstance()->SetTestingFactoryAndUse(
           profile_.get(), FakeSigninManager::Build));
     signin->SetAuthenticatedUsername("test_user");
     service_.reset(new TestProfileSyncService(
         new ProfileSyncComponentsFactoryMock(),
         profile_.get(),
         signin,
         ProfileSyncService::MANUAL_START,
         true,
-        base::Closure()));
+        TestProfileSyncService::NullCallback()));
   }
 
   DataTypeManagerMock* SetUpDataTypeManager() {
     DataTypeManagerMock* data_type_manager = new DataTypeManagerMock();
     EXPECT_CALL(*factory_mock(), CreateDataTypeManager(_, _)).
         WillOnce(Return(data_type_manager));
     return data_type_manager;
   }
 
   ProfileSyncComponentsFactoryMock* factory_mock() {
@@ skipping 14 matching lines @@
  protected:
   virtual void CreateSyncService() {
     SigninManager* signin = SigninManagerFactory::GetForProfile(profile_.get());
     signin->SetAuthenticatedUsername("test_user");
     service_.reset(new TestProfileSyncService(
         new ProfileSyncComponentsFactoryMock(),
         profile_.get(),
         signin,
         ProfileSyncService::AUTO_START,
         true,
-        base::Closure()));
+        TestProfileSyncService::NullCallback()));
   }
 };
 
 TEST_F(ProfileSyncServiceStartupTest, StartFirstTime) {
   DataTypeManagerMock* data_type_manager = SetUpDataTypeManager();
   EXPECT_CALL(*data_type_manager, Configure(_, _)).Times(0);
 
   // We've never completed startup.
   profile_->GetPrefs()->ClearPref(prefs::kSyncHasSetupCompleted);
   // Make sure SigninManager doesn't think we're signed in (undoes the call to
@@ skipping 202 matching lines @@
 
   // Preload the tokens.
   TokenServiceFactory::GetForProfile(profile_.get())->IssueAuthTokenForTest(
       GaiaConstants::kSyncService, "sync_token");
   service_->fail_initial_download();
 
   service_->Initialize();
   EXPECT_FALSE(service_->sync_initialized());
   EXPECT_FALSE(service_->GetBackendForTest());
 }