Don't show "Save password" prompt for a failed login

components/password_manager/core/browser/password_manager.h

 // Copyright (c) 2012 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_PASSWORD_MANAGER_H_
 #define COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_PASSWORD_MANAGER_H_
 
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 77 matching lines @@
 
   // Should be called when the user navigates the main frame.
   void DidNavigateMainFrame(bool is_in_page);
 
   // Handles password forms being parsed.
   void OnPasswordFormsParsed(
       const std::vector<autofill::PasswordForm>& forms);
 
   // Handles password forms being rendered.
   void OnPasswordFormsRendered(
-      const std::vector<autofill::PasswordForm>& visible_forms);
+      const std::vector<autofill::PasswordForm>& visible_forms,
+      bool did_stop_loading);
 
   // Handles a password form being submitted.
   virtual void OnPasswordFormSubmitted(
       const autofill::PasswordForm& password_form);
 
   PasswordManagerClient* client() { return client_; }
 
  private:
   enum ProvisionalSaveFailure {
     SAVING_DISABLED,
@@ skipping 72 matching lines @@
   // want to save passwords but will continue to fill passwords).
   BooleanPrefMember password_manager_enabled_;
 
   // Observers to be notified of LoginModel events.  This is mutable to allow
   // notification in const member functions.
   mutable ObserverList<LoginModelObserver> observers_;
 
   // Callbacks to be notified when a password form has been submitted.
   std::vector<PasswordSubmittedCallback> submission_callbacks_;
 
+  // Records all visible forms seen during a page load, in all frames of the
+  // page. When the page stops loading, the password manager checks if one of
+  // the recorded forms matches the login form from the previous page
+  // (to see if the login was a failure), and clears the vector.
+  std::vector<autofill::PasswordForm> all_visible_forms_;
+
   DISALLOW_COPY_AND_ASSIGN(PasswordManager);
 };
 
 }  // namespace password_manager
 
 #endif  // COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_PASSWORD_MANAGER_H_