Destroy (Password)AutofillAgent safely

components/autofill/content/renderer/password_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_PASSWORD_AUTOFILL_AGENT_H_
 #define COMPONENTS_AUTOFILL_CONTENT_RENDERER_PASSWORD_AUTOFILL_AGENT_H_
 
 #include <map>
 #include <memory>
 #include <vector>
@@ skipping 135 matching lines @@
   bool OnMessageReceived(const IPC::Message& message) override;
   void DidFinishDocumentLoad() override;
   void DidFinishLoad() override;
   void FrameDetached() override;
   void FrameWillClose() override;
   void DidStartProvisionalLoad() override;
   void DidCommitProvisionalLoad(bool is_new_navigation,
                                 bool is_same_page_navigation) override;
   void WillSendSubmitEvent(const blink::WebFormElement& form) override;
   void WillSubmitForm(const blink::WebFormElement& form) override;
+  void OnDestruct() override;
 
   // RenderView IPC handlers:
   void OnFillPasswordForm(int key, const PasswordFormFillData& form_data);
   void OnSetLoggingState(bool active);
   void OnAutofillUsernameAndPasswordDataReceived(
       const FormsPredictionsMap& predictions);
   void OnFindFocusedPasswordForm();
 
   // Scans the given frame for password forms and sends them up to the browser.
   // If |only_visible| is true, only forms visible in the layout are sent.
@@ skipping 72 matching lines @@
   // Contains server predictions for username, password and/or new password
   // fields for individual forms.
   FormsPredictionsMap form_predictions_;
 
   DISALLOW_COPY_AND_ASSIGN(PasswordAutofillAgent);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CONTENT_RENDERER_PASSWORD_AUTOFILL_AGENT_H_