Destroy (Password)AutofillAgent safely

components/autofill/content/renderer/autofill_agent.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_AUTOFILL_AGENT_H_
 #define COMPONENTS_AUTOFILL_CONTENT_RENDERER_AUTOFILL_AGENT_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 49 matching lines @@
   };
 
   // Thunk class for RenderViewObserver methods that haven't yet been migrated
   // to RenderFrameObserver. Should eventually be removed.
   // http://crbug.com/433486
   class LegacyAutofillAgent : public content::RenderViewObserver {
    public:
     LegacyAutofillAgent(content::RenderView* render_view, AutofillAgent* agent);
     ~LegacyAutofillAgent() override;
 
+    // Shuts the LegacyAutofillAgent down on RenderFrame deletion. Safe to call
+    // multiple times.
+    void Shutdown();
+
    private:
     // content::RenderViewObserver:
     void OnDestruct() override;
     void FocusChangeComplete() override;
 
     AutofillAgent* agent_;
 
     DISALLOW_COPY_AND_ASSIGN(LegacyAutofillAgent);
   };
   friend class LegacyAutofillAgent;
@@ skipping 28 matching lines @@
 
   // content::RenderFrameObserver:
   bool OnMessageReceived(const IPC::Message& message) override;
   void DidCommitProvisionalLoad(bool is_new_navigation,
                                 bool is_same_page_navigation) override;
   void DidFinishDocumentLoad() override;
   void WillSendSubmitEvent(const blink::WebFormElement& form) override;
   void WillSubmitForm(const blink::WebFormElement& form) override;
   void DidChangeScrollOffset() override;
   void FocusedNodeChanged(const blink::WebNode& node) override;
+  void OnDestruct() override;
+
+  // Shuts the AutofillAgent down on RenderFrame deletion. Safe to call multiple
+  // times.
+  void Shutdown();
 
   // Pass-through from LegacyAutofillAgent. This correlates with the
   // RenderViewObserver method.
   void FocusChangeComplete();
 
   // PageClickListener:
   void FormControlElementClicked(const blink::WebFormControlElement& element,
                                  bool was_focused) override;
 
   // blink::WebAutofillClient:
@@ skipping 146 matching lines @@
   bool is_generation_popup_possibly_visible_;
 
   base::WeakPtrFactory<AutofillAgent> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AutofillAgent);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CONTENT_RENDERER_AUTOFILL_AGENT_H_