Password Login Database: report correct changes from UpdateLogin().

components/password_manager/core/browser/login_database.h

 // Copyright 2014 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_PASSWORD_MANAGER_CORE_BROWSER_LOGIN_DATABASE_H_
 #define COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_LOGIN_DATABASE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 21 matching lines @@
 
   // Reports usage metrics to UMA.
   void ReportMetrics();
 
   // Adds |form| to the list of remembered password forms. Returns the list of
   // changes applied ({}, {ADD}, {REMOVE, ADD}). If it returns {REMOVE, ADD}
   // then the REMOVE is associated with the form that was added. Thus only the
   // primary key columns contain the values associated with the removed form.
   PasswordStoreChangeList AddLogin(const autofill::PasswordForm& form);
 
-  // Updates remembered password form. Returns true on success and sets
-  // items_changed (if non-NULL) to the number of logins updated.
-  bool UpdateLogin(const autofill::PasswordForm& form, int* items_changed);
+  // Updates existing password form. Returns the list of applied changes
+  // ({}, {UPDATE}). The password is looked up by the tuple {origin,
+  // username_element, username_value, password_element, signon_realm}.
+  // These columns stay intact.
+  PasswordStoreChangeList UpdateLogin(const autofill::PasswordForm& form);
 
   // Removes |form| from the list of remembered password forms.
   bool RemoveLogin(const autofill::PasswordForm& form);
 
   // Removes all logins created from |delete_begin| onwards (inclusive) and
   // before |delete_end|. You may use a null Time value to do an unbounded
   // delete in either direction.
   bool RemoveLoginsCreatedBetween(const base::Time delete_begin,
                                   const base::Time delete_end);
 
@@ skipping 76 matching lines @@
   sql::MetaTable meta_table_;
 
   PSLMatchingHelper psl_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(LoginDatabase);
 };
 
 }  // namespace password_manager
 
 #endif  // COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_LOGIN_DATABASE_H_