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

components/autofill/content/renderer/password_autofill_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_autofill_agent.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <string>
@@ skipping 1132 matching lines @@
     // RenderView to be instantiated (such as redirects to the WebStore)
     // we will never get to finish the load.
     GetPasswordManagerDriver()->PasswordFormSubmitted(*submitted_form);
     provisionally_saved_form_.reset();
   } else if (logger) {
     logger->LogMessage(Logger::STRING_FORM_IS_NOT_PASSWORD);
   }
 }
 
 void PasswordAutofillAgent::OnDestruct() {
+  binding_.Close();
   base::ThreadTaskRunnerHandle::Get()->DeleteSoon(FROM_HERE, this);
 }
 
 void PasswordAutofillAgent::DidStartProvisionalLoad() {
   std::unique_ptr<RendererSavePasswordProgressLogger> logger;
   if (logging_state_active_) {
     logger.reset(new RendererSavePasswordProgressLogger(
         GetPasswordManagerDriver().get()));
     logger->LogMessage(Logger::STRING_DID_START_PROVISIONAL_LOAD_METHOD);
   }
@@ skipping 339 matching lines @@
 PasswordAutofillAgent::GetPasswordManagerDriver() {
   if (!password_manager_driver_) {
     render_frame()->GetRemoteInterfaces()->GetInterface(
         mojo::GetProxy(&password_manager_driver_));
   }
 
   return password_manager_driver_;
 }
 
 }  // namespace autofill