Add counters for clicking on Form-Not-Secure warnings

components/password_manager/core/browser/password_manager_metrics_util.h

Index: components/password_manager/core/browser/password_manager_metrics_util.h
diff --git a/components/password_manager/core/browser/password_manager_metrics_util.h b/components/password_manager/core/browser/password_manager_metrics_util.h
index 2df5d745624f28a58afc5b7658024b3a0ad8e158..d9be1b8bd1529415e90e1aec90a2aa2018c96525 100644
--- a/components/password_manager/core/browser/password_manager_metrics_util.h
+++ b/components/password_manager/core/browser/password_manager_metrics_util.h
@@ -242,6 +242,10 @@ void LogPasswordReuse(int password_length,
                       int number_matches,
                       bool password_field_detected);
 
+// Log when the user selects the "Login not secure" warning in the password
+// autofill dropdown to show more information about the warning.
+void LogShowedHttpNotSecureExplanation();
+
 }  // namespace metrics_util
 
 }  // namespace password_manager