[Autofill] Close mojo interface bindings of autofill/password agent in time.

components/autofill/content/renderer/password_generation_agent.cc

 // 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.
 
 #include "components/autofill/content/renderer/password_generation_agent.h"
 
 #include <memory>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 172 matching lines @@
 }
 
 void PasswordGenerationAgent::DidFinishLoad() {
   // Since forms on some sites are available only at this event (but not at
   // DidFinishDocumentLoad), again call FindPossibleGenerationForm to detect
   // these forms (crbug.com/617893).
   FindPossibleGenerationForm();
 }
 
 void PasswordGenerationAgent::OnDestruct() {
+  binding_.Close();
   base::ThreadTaskRunnerHandle::Get()->DeleteSoon(FROM_HERE, this);
 }
 
 void PasswordGenerationAgent::OnDynamicFormsSeen() {
   FindPossibleGenerationForm();
 }
 
 void PasswordGenerationAgent::OnAllowToRunFormClassifier() {
   form_classifier_enabled_ = true;
 }
@@ skipping 373 matching lines @@
   GetAccountCreationPasswordFields(control_elements, &password_elements);
   password_elements = FindPasswordElementsForGeneration(
       password_elements, last_focused_password_element_.nameForAutofill());
   generation_form_data_.reset(new AccountCreationFormData(
       make_linked_ptr(password_form.release()), password_elements));
   is_manually_triggered_ = true;
   ShowGenerationPopup();
 }
 
 }  // namespace autofill