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

components/autofill/core/common/password_form.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_CORE_COMMON_PASSWORD_FORM_H__
 #define COMPONENTS_AUTOFILL_CORE_COMMON_PASSWORD_FORM_H__
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 247 matching lines @@
   // 'navigator.credentials.request()' without user interaction.
   // Once user selects this credential the flag is reseted.
   bool skip_zero_click;
 
   // The layout as determined during parsing. Default value is LAYOUT_OTHER.
   Layout layout;
 
   // If true, this form was parsed using Autofill predictions.
   bool was_parsed_using_autofill_predictions;
 
+  // TODO(vabr): Remove |is_alive| once http://crbug.com/486931 is fixed.
+  bool is_alive;  // Set on construction, reset on destruction.
+
   // Returns true if this match was found using public suffix matching.
   bool IsPublicSuffixMatch() const;
 
   // Equality operators for testing.
   bool operator==(const PasswordForm& form) const;
   bool operator!=(const PasswordForm& form) const;
 
   PasswordForm();
   ~PasswordForm();
 };
 
 // Map username to PasswordForm* for convenience. See password_form_manager.h.
 typedef std::map<base::string16, PasswordForm*> PasswordFormMap;
 
 typedef std::map<base::string16, const PasswordForm*> ConstPasswordFormMap;
 
 // For testing.
 std::ostream& operator<<(std::ostream& os, PasswordForm::Layout layout);
 std::ostream& operator<<(std::ostream& os, const autofill::PasswordForm& form);
 std::ostream& operator<<(std::ostream& os, autofill::PasswordForm* form);
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_COMMON_PASSWORD_FORM_H__