Fix ntp-tiles-internals crash in incognito mode

ios/chrome/browser/ui/webui/ntp_tiles_internals_ui.cc

Index: ios/chrome/browser/ui/webui/ntp_tiles_internals_ui.cc
diff --git a/ios/chrome/browser/ui/webui/ntp_tiles_internals_ui.cc b/ios/chrome/browser/ui/webui/ntp_tiles_internals_ui.cc
index ecf53866297617e9a2d6c91c097f6ded63559e30..c36e931e5feb725364f69e8e4331433b69d618bc 100644
--- a/ios/chrome/browser/ui/webui/ntp_tiles_internals_ui.cc
+++ b/ios/chrome/browser/ui/webui/ntp_tiles_internals_ui.cc
@@ -34,6 +34,7 @@ class IOSNTPTilesInternalsMessageHandlerBridge
   void RegisterMessages() override;
 
   // ntp_tiles::NTPTilesInternalsMessageHandlerClient
+  bool SupportsNTPTiles() override;
   bool DoesSourceExist(ntp_tiles::NTPTileSource source) override;
   std::unique_ptr<ntp_tiles::MostVisitedSites> MakeMostVisitedSites() override;
   std::unique_ptr<ntp_tiles::PopularSites> MakePopularSites() override;
@@ -54,6 +55,11 @@ void IOSNTPTilesInternalsMessageHandlerBridge::RegisterMessages() {
   handler_.RegisterMessages(this);
 }
 
+bool IOSNTPTilesInternalsMessageHandlerBridge::SupportsNTPTiles() {
+  auto* state = ios::ChromeBrowserState::FromWebUIIOS(web_ui());
+  return !state->HasOffTheRecordChromeBrowserState();
+}
+
 bool IOSNTPTilesInternalsMessageHandlerBridge::DoesSourceExist(
     ntp_tiles::NTPTileSource source) {
   switch (source) {