Settings Rewrite: Fix Opening Sync User login

chrome/browser/ui/webui/settings/people_handler.cc

Index: chrome/browser/ui/webui/settings/people_handler.cc
diff --git a/chrome/browser/ui/webui/settings/people_handler.cc b/chrome/browser/ui/webui/settings/people_handler.cc
index ffb02c86bbe84b5c77c26634ee626ccb6f7097a1..dda87644b0f90979730cf776033fb7c3b01e6637 100644
--- a/chrome/browser/ui/webui/settings/people_handler.cc
+++ b/chrome/browser/ui/webui/settings/people_handler.cc
@@ -601,7 +601,7 @@ void PeopleHandler::HandleShowSetupUI(const base::ListValue* args) {
   // If a setup wizard is present on this page or another, bring it to focus.
   // Otherwise, display a new one on this page.
   if (!FocusExistingWizardIfPresent())
-    OpenSyncSetup(args);
+    OpenSyncSetup(false /* creating_supervised_user */);
 }
 
 #if defined(OS_CHROMEOS)
@@ -617,7 +617,11 @@ void PeopleHandler::HandleDoSignOutOnAuthError(const base::ListValue* args) {
 void PeopleHandler::HandleStartSignin(const base::ListValue* args) {
   // Should only be called if the user is not already signed in.
   DCHECK(!SigninManagerFactory::GetForProfile(profile_)->IsAuthenticated());
-  OpenSyncSetup(args);
+  std::string access_point;
+  bool creating_supervised_user =
+      args->GetString(0, &access_point) &&
+      access_point == "access-point-supervised-user";
+  OpenSyncSetup(creating_supervised_user);
 }
 
 void PeopleHandler::HandleStopSyncing(const base::ListValue* args) {
@@ -699,7 +703,7 @@ void PeopleHandler::CloseSyncSetup() {
   configuring_sync_ = false;
 }
 
-void PeopleHandler::OpenSyncSetup(const base::ListValue* args) {
+void PeopleHandler::OpenSyncSetup(bool creating_supervised_user) {
   if (!PrepareSyncSetup())
     return;
 
@@ -724,15 +728,10 @@ void PeopleHandler::OpenSyncSetup(const base::ListValue* args) {
     // setup including any visible overlays, and display the gaia auth page.
     // Control will be returned to the sync settings page once auth is complete.
     CloseUI();
-    if (args) {
-      std::string access_point = base::UTF16ToUTF8(ExtractStringValue(args));
-      if (access_point == "access-point-supervised-user") {
-        DisplayGaiaLogin(
-            signin_metrics::AccessPoint::ACCESS_POINT_SUPERVISED_USER);
-        return;
-      }
-    }
-    DisplayGaiaLogin(signin_metrics::AccessPoint::ACCESS_POINT_SETTINGS);
+    DisplayGaiaLogin(
+        creating_supervised_user
+            ? signin_metrics::AccessPoint::ACCESS_POINT_SUPERVISED_USER
+            : signin_metrics::AccessPoint::ACCESS_POINT_SETTINGS);
     return;
   }
 #endif