Use an OOPIF-compatible call chain when finding the top-level frame

components/autofill/content/renderer/password_autofill_agent.cc

Index: components/autofill/content/renderer/password_autofill_agent.cc
diff --git a/components/autofill/content/renderer/password_autofill_agent.cc b/components/autofill/content/renderer/password_autofill_agent.cc
index 9bbdd135fd977e88b99a38d84eba181a2a8f9ebe..69a16f4d6ebf9c48a53057358509d638ba1d2b2d 100644
--- a/components/autofill/content/renderer/password_autofill_agent.cc
+++ b/components/autofill/content/renderer/password_autofill_agent.cc
@@ -853,12 +853,10 @@ bool PasswordAutofillAgent::ShowSuggestions(
     if ((element.isPasswordField() ||
          HasAutocompleteAttributeValue(element, "username")) &&
         security_state::IsHttpWarningInFormEnabled() &&
-        !content::IsOriginSecure(url::Origin(render_frame()
-                                                 ->GetRenderView()
-                                                 ->GetMainRenderFrame()
-                                                 ->GetWebFrame()
-                                                 ->getSecurityOrigin())
-                                     .GetURL())) {
+        !content::IsOriginSecure(
+            url::Origin(
+                render_frame()->GetWebFrame()->top()->getSecurityOrigin())
+                .GetURL())) {
       autofill_agent_->ShowNotSecureWarning(element);
       return true;
     }