Don't show release notes if in Kiosk Mode.

chrome/browser/chromeos/login/existing_user_controller.cc

Index: chrome/browser/chromeos/login/existing_user_controller.cc
diff --git a/chrome/browser/chromeos/login/existing_user_controller.cc b/chrome/browser/chromeos/login/existing_user_controller.cc
index efa76454fc4d58d771d8c7323cef52a2b32325e6..a5b0ac427bec9cd43440eeeb8c8ea4ce65ef7c6f 100644
--- a/chrome/browser/chromeos/login/existing_user_controller.cc
+++ b/chrome/browser/chromeos/login/existing_user_controller.cc
@@ -25,6 +25,7 @@
 #include "chrome/browser/chromeos/cros/network_library.h"
 #include "chrome/browser/chromeos/cros_settings.h"
 #include "chrome/browser/chromeos/customization_document.h"
+#include "chrome/browser/chromeos/kiosk_mode/kiosk_mode_settings.h"
 #include "chrome/browser/chromeos/login/helper.h"
 #include "chrome/browser/chromeos/login/login_display_host.h"
 #include "chrome/browser/chromeos/login/login_utils.h"
@@ -783,7 +784,7 @@ std::string ExistingUserController::GetGettingStartedGuideURL() const {
 void ExistingUserController::OptionallyShowReleaseNotes(
     Profile* profile) const {
   // TODO(nkostylev): Fix WizardControllerFlowTest case.
-  if (!profile)
+  if (!profile || KioskModeSettings::Get()->IsKioskModeEnabled())
     return;
   PrefService* prefs = profile->GetPrefs();
   chrome::VersionInfo version_info;