Use password_manager::metrics_util::ResponseType on iOS

ios/chrome/browser/passwords/ios_chrome_save_password_infobar_delegate.h

Index: ios/chrome/browser/passwords/ios_chrome_save_password_infobar_delegate.h
diff --git a/ios/chrome/browser/passwords/ios_chrome_save_password_infobar_delegate.h b/ios/chrome/browser/passwords/ios_chrome_save_password_infobar_delegate.h
index 76cbf335ccc5c7b72dc69d8a45d6473cffacbd04..baf891e35927be9b33cde3ca048963f2c4c8a8d6 100644
--- a/ios/chrome/browser/passwords/ios_chrome_save_password_infobar_delegate.h
+++ b/ios/chrome/browser/passwords/ios_chrome_save_password_infobar_delegate.h
@@ -8,6 +8,7 @@
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "components/infobars/core/confirm_infobar_delegate.h"
+#include "components/password_manager/core/browser/password_manager_metrics_util.h"
 
 namespace password_manager {
 class PasswordFormManager;
@@ -33,13 +34,6 @@ class IOSChromeSavePasswordInfoBarDelegate : public ConfirmInfoBarDelegate {
   ~IOSChromeSavePasswordInfoBarDelegate() override;
 
  private:
-  enum ResponseType {
-    NO_RESPONSE = 0,
-    REMEMBER_PASSWORD,
-    DO_NOT_REMEMBER_PASSWORD,
-    NUM_RESPONSE_TYPES,
-  };
-
   IOSChromeSavePasswordInfoBarDelegate(
       bool is_smart_lock_branding_enabled,
       scoped_ptr<password_manager::PasswordFormManager> form_to_save);
@@ -60,7 +54,7 @@ class IOSChromeSavePasswordInfoBarDelegate : public ConfirmInfoBarDelegate {
   scoped_ptr<password_manager::PasswordFormManager> form_to_save_;
 
   // Used to track the results we get from the info bar.
-  ResponseType infobar_response_;
+  password_manager::metrics_util::ResponseType infobar_response_;
 
   // Whether to show the password manager branded as Smart Lock.
   bool is_smart_lock_branding_enabled_;