Update autocomplete dropdown when datalist changes.

components/autofill/content/renderer/autofill_agent.cc

Index: components/autofill/content/renderer/autofill_agent.cc
diff --git a/components/autofill/content/renderer/autofill_agent.cc b/components/autofill/content/renderer/autofill_agent.cc
index 02bfd51ab328169b849314e565b89fe6a74c14b6..36f688f348f8fd88c9c816083531da332bb71da7 100644
--- a/components/autofill/content/renderer/autofill_agent.cc
+++ b/components/autofill/content/renderer/autofill_agent.cc
@@ -449,6 +449,13 @@ void AutofillAgent::openTextDataListChooser(const WebInputElement& element) {
   ShowSuggestions(element, options);
 }
 
+void AutofillAgent::dataListOptionsChanged(const WebInputElement& element) {
+  if (!is_popup_possibly_visible_ || !element.focused())
+    return;
+
+  TextFieldDidChangeImpl(element);
+}
+
 void AutofillAgent::firstUserGestureObserved() {
   password_autofill_agent_->FirstUserGestureObserved();
   Send(new AutofillHostMsg_FirstUserGestureObserved(routing_id()));