[Smart Lock] Fix "turn off" button in auto-signin first run experience.

components/password_manager/core/browser/password_bubble_experiment.cc

Index: components/password_manager/core/browser/password_bubble_experiment.cc
diff --git a/components/password_manager/core/browser/password_bubble_experiment.cc b/components/password_manager/core/browser/password_bubble_experiment.cc
index 6c9d60f923863c27b9bf8f1dbe7d7f29202cddc5..51717873430a3bd9eb7fdfde83711bac27dbb814 100644
--- a/components/password_manager/core/browser/password_bubble_experiment.cc
+++ b/components/password_manager/core/browser/password_bubble_experiment.cc
@@ -93,8 +93,8 @@ void RecordAutoSignInPromptFirstRunExperienceWasShown(PrefService* prefs) {
 }
 
 void TurnOffAutoSignin(PrefService* prefs) {
-  prefs->SetBoolean(
-      password_manager::prefs::kWasAutoSignInFirstRunExperienceShown, true);
+  prefs->SetBoolean(password_manager::prefs::kCredentialsEnableAutosignin,
+                    false);
 }
 
 }  // namespace password_bubble_experiment