sync: remove GetAuthenticatedUsername from ProfileSyncService/SyncBackendHost.

chrome/browser/sync/sync_setup_flow.cc

Index: chrome/browser/sync/sync_setup_flow.cc
diff --git a/chrome/browser/sync/sync_setup_flow.cc b/chrome/browser/sync/sync_setup_flow.cc
index fb5e4c3929ab7dd6576fc75daf764ae583a16b1f..e15bf7360d9584f31c80f1324162308a69b24223 100644
--- a/chrome/browser/sync/sync_setup_flow.cc
+++ b/chrome/browser/sync/sync_setup_flow.cc
@@ -103,10 +103,8 @@ void SyncSetupFlow::GetArgsForGaiaLogin(const ProfileSyncService* service,
     args->SetBoolean("editable_user", true);
   } else {
     string16 user;
-    if (!service->cros_user().empty())
-      user = UTF8ToUTF16(service->cros_user());
-    else
-      user = service->GetAuthenticatedUsername();
+    user = UTF8ToUTF16(service->profile()->GetPrefs()->GetString(
+        prefs::kGoogleServicesUsername));
     args->SetString("user", user);
     args->SetInteger("error", 0);
     args->SetBoolean("editable_user", user.empty());
@@ -496,7 +494,9 @@ void SyncSetupFlow::ActivateState(SyncSetupWizard::State state) {
     }
     case SyncSetupWizard::DONE:
     case SyncSetupWizard::ABORT:
-      flow_handler_->ShowSetupDone(service_->GetAuthenticatedUsername());
+      flow_handler_->ShowSetupDone(UTF8ToUTF16(
+          service_->profile()->GetPrefs()->GetString(
+          prefs::kGoogleServicesUsername)));
       break;
     default:
       NOTREACHED() << "Invalid advance state: " << state;