cros: Fix launch Guest session from the error screen.

Was broken by CL:2297621

Fixed: 1109179
Change-Id: Ieeb06baa6b42cbd89df462966bf30977b3fb8fa7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2320574
Auto-Submit: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Renato Silva <rrsilva@google.com>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792258}

chrome/browser/resources/chromeos/login/cr_ui.js

@@ -267,7 +267,7 @@ cr.define('cr.ui', function() {
    */
   Oobe.guestLoginForTesting = function() {
     Oobe.skipToLoginForTesting();
-    chrome.send('launchIncognitoForTesting');
+    chrome.send('launchIncognito');
   };
 
   /**

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc

@@ -407,8 +407,7 @@ void SigninScreenHandler::RegisterMessages() {
   AddCallback("authenticateUser", &SigninScreenHandler::HandleAuthenticateUser);
   AddCallback("completeOfflineAuthentication",
               &SigninScreenHandler::HandleCompleteOfflineAuthentication);
-  AddCallback("launchIncognitoForTesting",
-              &SigninScreenHandler::HandleLaunchIncognitoForTesting);
+  AddCallback("launchIncognito", &SigninScreenHandler::HandleLaunchIncognito);
   AddCallback("launchSAMLPublicSession",
               &SigninScreenHandler::HandleLaunchSAMLPublicSession);
   AddRawCallback("offlineLogin", &SigninScreenHandler::HandleOfflineLogin);
@@ -1031,7 +1030,7 @@ void SigninScreenHandler::HandleCompleteOfflineAuthentication(
                            false /* authenticated_by_pin */);
 }
 
-void SigninScreenHandler::HandleLaunchIncognitoForTesting() {
+void SigninScreenHandler::HandleLaunchIncognito() {
   UserContext context(user_manager::USER_TYPE_GUEST, EmptyAccountId());
   if (delegate_)
     delegate_->Login(context, SigninSpecifics());

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h

@@ -272,7 +272,7 @@ class SigninScreenHandler
                               bool authenticated_by_pin);
   void HandleCompleteOfflineAuthentication(const std::string& email,
                                            const std::string& password);
-  void HandleLaunchIncognitoForTesting();
+  void HandleLaunchIncognito();
   void HandleLaunchSAMLPublicSession(const std::string& email);
   void HandleOfflineLogin(const base::ListValue* args);
   void HandleToggleEnrollmentScreen();