[Autofill] Don't hold onto stale form field pointers

components/autofill/content/renderer/form_cache.h

Index: components/autofill/content/renderer/form_cache.h
diff --git a/components/autofill/content/renderer/form_cache.h b/components/autofill/content/renderer/form_cache.h
index f534e20d017c50e933b6e73fa0547095866ad2a5..15c568056c872a2a5ed5c3950718eca6a2e73bef 100644
--- a/components/autofill/content/renderer/form_cache.h
+++ b/components/autofill/content/renderer/form_cache.h
@@ -57,6 +57,10 @@ class FormCache {
       const std::vector<blink::WebFormControlElement>& control_elements,
       bool log_deprecation_messages);
 
+  // Saves initial state of checkbox and select elements.
+  void SaveInitialValues(
+      const std::vector<blink::WebFormControlElement>& control_elements);
+
   // The frame this FormCache is associated with.
   const blink::WebFrame& frame_;