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

components/autofill/content/renderer/form_cache.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_AUTOFILL_CONTENT_RENDERER_FORM_CACHE_H_
 #define COMPONENTS_AUTOFILL_CONTENT_RENDERER_FORM_CACHE_H_
 
 #include <map>
 #include <set>
 #include <vector>
@@ skipping 39 matching lines @@
 
  private:
   // Scans |control_elements| and returns the number of editable elements.
   // Also remembers the initial <select> and <input> element states, and
   // logs warning messages for deprecated attribute if
   // |log_deprecation_messages| is set.
   size_t ScanFormControlElements(
       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_;
 
   // The cached forms. Used to prevent re-extraction of forms.
   std::set<FormData> parsed_forms_;
 
   // The synthetic FormData is for all the fieldsets in the document without a
   // form owner.
   FormData synthetic_form_;
 
   // The cached initial values for <select> elements.
   std::map<const blink::WebSelectElement, base::string16>
       initial_select_values_;
 
   // The cached initial values for checkable <input> elements.
   std::map<const blink::WebInputElement, bool> initial_checked_state_;
 
   DISALLOW_COPY_AND_ASSIGN(FormCache);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CONTENT_RENDERER_FORM_CACHE_H_