Use password_manager::metrics_util::ResponseType on iOS

ios/chrome/browser/passwords/ios_chrome_save_password_infobar_delegate.mm

Index: ios/chrome/browser/passwords/ios_chrome_save_password_infobar_delegate.mm
diff --git a/ios/chrome/browser/passwords/ios_chrome_save_password_infobar_delegate.mm b/ios/chrome/browser/passwords/ios_chrome_save_password_infobar_delegate.mm
index 67242515756b061f216787ee69b50e38f226c1b2..67da5c4e5e8399278dda1e61f9ccd100523b22c2 100644
--- a/ios/chrome/browser/passwords/ios_chrome_save_password_infobar_delegate.mm
+++ b/ios/chrome/browser/passwords/ios_chrome_save_password_infobar_delegate.mm
@@ -40,14 +40,15 @@ void IOSChromeSavePasswordInfoBarDelegate::Create(
 
 IOSChromeSavePasswordInfoBarDelegate::~IOSChromeSavePasswordInfoBarDelegate() {
   UMA_HISTOGRAM_ENUMERATION("PasswordManager.InfoBarResponse",
-                            infobar_response_, NUM_RESPONSE_TYPES);
+                            infobar_response_,
+                            password_manager::metrics_util::NUM_RESPONSE_TYPES);
 }
 
 IOSChromeSavePasswordInfoBarDelegate::IOSChromeSavePasswordInfoBarDelegate(
     bool is_smart_lock_branding_enabled,
     scoped_ptr<PasswordFormManager> form_to_save)
     : form_to_save_(std::move(form_to_save)),
-      infobar_response_(NO_RESPONSE),
+      infobar_response_(password_manager::metrics_util::NO_RESPONSE),
       is_smart_lock_branding_enabled_(is_smart_lock_branding_enabled) {}
 
 infobars::InfoBarDelegate::Type
@@ -85,14 +86,14 @@ base::string16 IOSChromeSavePasswordInfoBarDelegate::GetButtonLabel(
 bool IOSChromeSavePasswordInfoBarDelegate::Accept() {
   DCHECK(form_to_save_);
   form_to_save_->Save();
-  infobar_response_ = REMEMBER_PASSWORD;
+  infobar_response_ = password_manager::metrics_util::REMEMBER_PASSWORD;
   return true;
 }
 
 bool IOSChromeSavePasswordInfoBarDelegate::Cancel() {
   DCHECK(form_to_save_);
   form_to_save_->PermanentlyBlacklist();
-  infobar_response_ = DO_NOT_REMEMBER_PASSWORD;
+  infobar_response_ = password_manager::metrics_util::NEVER_REMEMBER_PASSWORD;
   return true;
 }