[Password manager] Temporarily add some CHECKs to investigate a crash

components/autofill/core/common/password_form.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 <ostream>
 #include <sstream>
 
 #include "base/json/json_writer.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_util.h"
@@ skipping 58 matching lines @@
       password_autocomplete_set(true),
       new_password_marked_by_site(false),
       ssl_valid(false),
       preferred(false),
       blacklisted_by_user(false),
       type(TYPE_MANUAL),
       times_used(0),
       generation_upload_status(NO_SIGNAL_SENT),
       skip_zero_click(false),
       layout(Layout::LAYOUT_OTHER),
-      was_parsed_using_autofill_predictions(false) {
+      was_parsed_using_autofill_predictions(false),
+      is_alive(true) {
 }
 
 PasswordForm::~PasswordForm() {
+  CHECK(is_alive);
+  is_alive = false;
 }
 
 bool PasswordForm::IsPublicSuffixMatch() const {
+  CHECK(is_alive);
   return !original_signon_realm.empty();
 }
 
 bool PasswordForm::operator==(const PasswordForm& form) const {
   return scheme == form.scheme &&
       signon_realm == form.signon_realm &&
       original_signon_realm == form.original_signon_realm &&
       origin == form.origin &&
       action == form.action &&
       submit_element == form.submit_element &&
@@ skipping 63 matching lines @@
       &form_json, base::JSONWriter::OPTIONS_PRETTY_PRINT, &form_as_string);
   base::TrimWhitespaceASCII(form_as_string, base::TRIM_ALL, &form_as_string);
   return os << "PasswordForm(" << form_as_string << ")";
 }
 
 std::ostream& operator<<(std::ostream& os, PasswordForm* form) {
   return os << "&" << *form;
 }
 
 }  // namespace autofill