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

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

 // Copyright 2015 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.
 
 #include "chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/i18n/number_formatting.h"
@@ skipping 1176 matching lines @@
 
   html_source->AddString("syncErrorHelpUrl", chrome::kSyncErrorsHelpURL);
 
   html_source->AddString("activityControlsUrl",
                          chrome::kGoogleAccountActivityControlsURL);
 
   html_source->AddBoolean("profileShortcutsEnabled",
                           ProfileShortcutManager::IsFeatureEnabled());
 }
 
-void AddPrintingStrings(content::WebUIDataSource* html_source) {
+void AddPrintingStrings(content::WebUIDataSource* html_source,
+                        Profile* profile) {
   LocalizedString localized_strings[] = {
     {"printingPageTitle", IDS_SETTINGS_PRINTING},
     {"printingCloudPrintLearnMoreLabel",
      IDS_SETTINGS_PRINTING_CLOUD_PRINT_LEARN_MORE_LABEL},
     {"printingNotificationsLabel", IDS_SETTINGS_PRINTING_NOTIFICATIONS_LABEL},
     {"printingManageCloudPrintDevices",
      IDS_SETTINGS_PRINTING_MANAGE_CLOUD_PRINT_DEVICES},
     {"printingManageCloudPrintDevicesDescription",
      IDS_SETTINGS_PRINTING_MANAGE_CLOUD_PRINT_DEVICES_DESCRIPTION},
     {"cloudPrintersTitle", IDS_SETTINGS_PRINTING_CLOUD_PRINTERS},
@@ skipping 60 matching lines @@
   AddLocalizedStringsBulk(html_source, localized_strings,
                           arraysize(localized_strings));
 
   html_source->AddString("devicesUrl", chrome::kChromeUIDevicesURL);
   html_source->AddString("printingCloudPrintLearnMoreUrl",
                          chrome::kCloudPrintLearnMoreURL);
 
 #if defined(OS_CHROMEOS)
   html_source->AddBoolean("showCupsPrintingFeatures",
                           base::CommandLine::ForCurrentProcess()->HasSwitch(
-                              ::switches::kEnableNativeCups));
+                              ::switches::kEnableNativeCups) &&
+                              !profile->IsOffTheRecord());
 #endif
 }
 
 void AddPrivacyStrings(content::WebUIDataSource* html_source,
                        Profile* profile) {
   LocalizedString localized_strings[] = {
       {"privacyPageTitle", IDS_SETTINGS_PRIVACY},
       {"linkDoctorPref", IDS_SETTINGS_LINKDOCTOR_PREF},
       {"searchSuggestPref", IDS_SETTINGS_SUGGEST_PREF},
       {"networkPredictionEnabled",
@@ skipping 491 matching lines @@
   AddA11yStrings(html_source);
   AddAboutStrings(html_source);
   AddAppearanceStrings(html_source, profile);
   AddClearBrowsingDataStrings(html_source);
   AddCommonStrings(html_source, profile);
   AddDownloadsStrings(html_source);
   AddLanguagesStrings(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);
   AddSearchInSettingsStrings(html_source);
   AddSearchStrings(html_source);
   AddSiteSettingsStrings(html_source, profile);
   AddUsersStrings(html_source);
   AddWebContentStrings(html_source);
 
 #if defined(OS_CHROMEOS)
@@ skipping 14 matching lines @@
 #if defined(USE_NSS_CERTS)
   AddCertificateManagerStrings(html_source);
 #endif
 
   policy_indicator::AddLocalizedStrings(html_source);
 
   html_source->SetJsonPath(kLocalizedStringsFile);
 }
 
 }  // namespace settings