Add OnPasswordChangeDetected override to pw change manager.

Trying to change the cryptohome password but supplying the wrong
old password, can result in an "OnPasswordChangeDetected" instead
of an OnAuthFailure. So, detect either one and treat them both
as "incorrect old password", prompting the user to try again.

Bug: 930109
Change-Id: I9aae5a52e377215f55ea0f788ff0ffacd2118865
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1724076Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: A Olsen <olsen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681766}

chrome/browser/chromeos/login/saml/in_session_password_change_manager.cc

@@ -287,6 +287,11 @@ void InSessionPasswordChangeManager::OnAuthFailure(const AuthFailure& error) {
   NotifyObservers(CRYPTOHOME_PASSWORD_CHANGE_FAILURE);
 }
 
+void InSessionPasswordChangeManager::OnPasswordChangeDetected() {
+  VLOG(1) << "Failed to change cryptohome password: PasswordChangeDetected";
+  NotifyObservers(CRYPTOHOME_PASSWORD_CHANGE_FAILURE);
+}
+
 void InSessionPasswordChangeManager::OnAuthSuccess(
     const UserContext& user_context) {
   VLOG(3) << "Cryptohome password is changed.";

chrome/browser/chromeos/login/saml/in_session_password_change_manager.h

@@ -145,6 +145,7 @@ class InSessionPasswordChangeManager : public AuthStatusConsumer,
 
   // AuthStatusConsumer:
   void OnAuthFailure(const AuthFailure& error) override;
+  void OnPasswordChangeDetected() override;
   void OnAuthSuccess(const UserContext& user_context) override;
 
   // ash::SessionActivationObserver: