Make sure auth error reporting handles guest mode correctly.

chrome/browser/ui/views/profiles/profile_chooser_view.cc

Index: chrome/browser/ui/views/profiles/profile_chooser_view.cc
diff --git a/chrome/browser/ui/views/profiles/profile_chooser_view.cc b/chrome/browser/ui/views/profiles/profile_chooser_view.cc
index a110cac6ba5d5435cd9c899ff1fd423b228c2cb6..34f8936515d03c77304b55f4fb81aeadd9b264e9 100644
--- a/chrome/browser/ui/views/profiles/profile_chooser_view.cc
+++ b/chrome/browser/ui/views/profiles/profile_chooser_view.cc
@@ -100,16 +100,14 @@ gfx::ImageSkia CreateSquarePlaceholderImage(int size) {
 }
 
 bool HasAuthError(Profile* profile) {
-  SigninErrorController* error =
-      ProfileOAuth2TokenServiceFactory::GetForProfile(profile)->
-          signin_error_controller();
+  const SigninErrorController* error =
+      profiles::GetSigninErrorController(profile);
   return error && error->HasError();
 }
 
 std::string GetAuthErrorAccountId(Profile* profile) {
-  SigninErrorController* error =
-      ProfileOAuth2TokenServiceFactory::GetForProfile(profile)->
-          signin_error_controller();
+  const SigninErrorController* error =
+      profiles::GetSigninErrorController(profile);
   if (!error)
     return std::string();
 
@@ -117,9 +115,8 @@ std::string GetAuthErrorAccountId(Profile* profile) {
 }
 
 std::string GetAuthErrorUsername(Profile* profile) {
-  SigninErrorController* error =
-      ProfileOAuth2TokenServiceFactory::GetForProfile(profile)->
-          signin_error_controller();
+  const SigninErrorController* error =
+      profiles::GetSigninErrorController(profile);
   if (!error)
     return std::string();