PlzNavigate: Invoke didStartProvisionalLoad() when the renderer initiates a navigation in startLoad(

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 69a16f4d6ebf9c48a53057358509d638ba1d2b2d..c0f4472bf82f7994cf80a9b04a339cc7f02eba8a 100644
--- a/components/autofill/content/renderer/password_autofill_agent.cc
+++ b/components/autofill/content/renderer/password_autofill_agent.cc
@@ -1167,7 +1167,8 @@ void PasswordAutofillAgent::OnDestruct() {
   base::ThreadTaskRunnerHandle::Get()->DeleteSoon(FROM_HERE, this);
 }
 
-void PasswordAutofillAgent::DidStartProvisionalLoad() {
+void PasswordAutofillAgent::DidStartProvisionalLoad(
+    blink::WebDataSource* data_source) {
   std::unique_ptr<RendererSavePasswordProgressLogger> logger;
   if (logging_state_active_) {
     logger.reset(new RendererSavePasswordProgressLogger(
@@ -1186,8 +1187,7 @@ void PasswordAutofillAgent::DidStartProvisionalLoad() {
   // the user is performing actions outside the page (e.g. typed url,
   // history navigation). We don't want to trigger saving in these cases.
   content::DocumentState* document_state =
-      content::DocumentState::FromDataSource(
-          navigated_frame->provisionalDataSource());
+      content::DocumentState::FromDataSource(data_source);
   content::NavigationState* navigation_state =
       document_state->navigation_state();
   ui::PageTransition type = navigation_state->GetTransitionType();