[CUPS] Fix the browser crash in CUPS settings UI in guest mode.

chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.cc

Index: chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.cc
diff --git a/chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.cc b/chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.cc
index e51110a711d016d2690bd522b177b563e444e4cd..840bbb8d2a472c77d6805a1b9e53ec12466de183 100644
--- a/chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.cc
+++ b/chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.cc
@@ -1194,7 +1194,8 @@ void AddPeopleStrings(content::WebUIDataSource* html_source) {
                           ProfileShortcutManager::IsFeatureEnabled());
 }
 
-void AddPrintingStrings(content::WebUIDataSource* html_source) {
+void AddPrintingStrings(content::WebUIDataSource* html_source,
+                        Profile* profile) {
   LocalizedString localized_strings[] = {
     {"printingPageTitle", IDS_SETTINGS_PRINTING},
     {"printingCloudPrintLearnMoreLabel",
@@ -1275,7 +1276,8 @@ void AddPrintingStrings(content::WebUIDataSource* html_source) {
 #if defined(OS_CHROMEOS)
   html_source->AddBoolean("showCupsPrintingFeatures",
                           base::CommandLine::ForCurrentProcess()->HasSwitch(
-                              ::switches::kEnableNativeCups));
+                              ::switches::kEnableNativeCups) &&
+                              !profile->IsOffTheRecord());
 #endif
 }
 
@@ -1787,7 +1789,7 @@ void AddLocalizedStrings(content::WebUIDataSource* html_source,
   AddOnStartupStrings(html_source);
   AddPasswordsAndFormsStrings(html_source);
   AddPeopleStrings(html_source);
-  AddPrintingStrings(html_source);
+  AddPrintingStrings(html_source, profile);
   AddPrivacyStrings(html_source, profile);
   AddResetStrings(html_source);
   AddSearchEnginesStrings(html_source);