Replace direct access to kGoogleServicesUsername with calls to SigninManager.

chrome/browser/ui/webui/options/sync_setup_handler_unittest.cc

Index: chrome/browser/ui/webui/options/sync_setup_handler_unittest.cc
diff --git a/chrome/browser/ui/webui/options/sync_setup_handler_unittest.cc b/chrome/browser/ui/webui/options/sync_setup_handler_unittest.cc
index f217fca3e52326a8ba2a752cde80d5d368a6fc51..3bd9856d56d711f9eefea6837454373eaf8a8698 100644
--- a/chrome/browser/ui/webui/options/sync_setup_handler_unittest.cc
+++ b/chrome/browser/ui/webui/options/sync_setup_handler_unittest.cc
@@ -276,11 +276,8 @@ class SyncSetupHandlerTest : public testing::Test {
     mock_signin_ = static_cast<SigninManagerBase*>(
         SigninManagerFactory::GetForProfile(profile_.get()));
     std::string username = GetTestUser();
-    if (!username.empty()) {
+    if (!username.empty())
       mock_signin_->SetAuthenticatedUsername(username);
-      profile_->GetPrefs()->SetString(prefs::kGoogleServicesUsername,
-                                      username);
-    }
 
     mock_pss_ = static_cast<ProfileSyncServiceMock*>(
         ProfileSyncServiceFactory::GetInstance()->SetTestingFactoryAndUse(